In rapid?
How do I get to 1700 rapid elo this year?

Yes, in rapid. Now it is 1153 for me and I've made 50 elo of progress. I do think it'll get a lot harder to make progress so it may be tough. I played tactics somewhat with previous accounts and in lichess

Improving Your Chess - Resources for Beginners and Beyond.....
https://www.chess.com/blog/RussBell/improving-your-chess-resources-for-beginners-and-beyond
https://www.chess.com/blog/RussBell
Always check your intended move is no blunder before you play it. That little mental discipline alone is enough to reach 1500.
Whenever you lose a game, analyse it thoroughly so as to learn from your mistakes.

I agree with you. You think my main problem is checking the intended moves before playing? I share your view - in Aimchess I'm much better at tactics than preventing blunders.

The biggest reason people struggle in lower-level chess is because of blunders. They make them in almost every game.
A mistake can instantly put you in a bad position, no matter how well you played earlier: if you had great opening knowledge, great positional skills, great endgame skills, whatever; a single mistake can change everything (you lose a piece or get checkmated).
So, how do you avoid blunders? Follow this simple algorithm:
While avoiding blunders is crucial, I also share a few basic principles with my students. These principles help them figure out what to do in each part of the game - the opening, the middlegame, and the endgame. Understanding these simple principles is like having a map for your moves. I provide my students with more advanced algorithms that incorporate these fundamental principles. When you use this knowledge along with being careful about blunders, you're not just getting better at defending. You're also learning a well-rounded approach to chess. Keep in mind, chess is not just about not making mistakes; it's about making smart and planned moves to outsmart your opponent.

I made it to 1499 just last week and got knocked all the way down damn near to 1200. Making the climb, again... I need to analyze the board and pay attention to what the opener is doing. Instead, I do what I want to do and lose many games in a row. Making it to 1700? It will be a while before I am that good.

There were a few things that I noticed when looking over your games. The first is that you don't use your time that well. You will play an entire game, and lose when you have 10 minutes left on your clock. If you use your time to analyze, and calculate then that would prevent some of those loses. The loses I looked at were because of tactics/blunders, and these tactics/blunders were not because you were in time pressure, or in a very complicated position. You either didn't see the threat, or did not calculate the entire exchange through tactically.
You moving too fast also effects your wins to. When you move too fast you miss tactics that would allow for a much easier victory, or you miss play the position. There is no problem in taking a couple minutes to analyze or calculate out a position when necessary. Stronger players will make you pay for not calculating or miscalculating (most of the mistakes I found were probably a result of miscalculations) out a position. A good example of this is your game against Varsha2010:
There are a number of things you will need to learn to reach 1700, but the first things you should focus on are 1. Use your time. It won't make a difference if you beat your opponent with 30 sec left on the clock or 10 min. A win is a win. Avoiding blunders, calculating exchanges, and looking at the advantages and disadvantages of each side by using your time will win games though. 2. Tactics/not blundering. As tygxc stated always check your intended move is not a blunder. I would also add always ask yourself why your opponent made their move. This will help prevent you falling for traps or tactics that could be prevented. To put in perspective how much better you will need to get tactically a typical 1700 on this site will have a puzzle rating of around 2700. I don't know if you do puzzles on another site or not, but you need to do puzzles daily (I didn't see you had done a lot on this site, but your games suggest that you have done a decent amount of puzzles in the past). 3. Endgames. It looks like you know what principles of the endgame are (although still room for improvement in how well you execute them in a game, but you did a good job of following them for the most part). You should mainly focus on king and pawn endgames. It was apparent in the game above that you have not studied them at all.
You don't need to focus on openings right now. It seems you know enough to where you don't need to spend a lot time on them at this point. Later when you get better you will, but not right now. I would focus on strategy before studying openings after you focus on what I mentioned above (well that and even more endgames and tactics(these are constant)).
The resources that RussBell linked to in his post will help you learn what I have mentioned. As you mentioned in your post it will get a lot harder to improve, but it can be done.
Hope this helps.
As a New Year's resolution. Any tips that you have? You can analyse my profile and find weaknesses for me to improve on. Is this even possible to go from about 1100 rapid in late Dec 2023 towards 1700 rapid if I practice almost every day?
I started chess about Oct-Nov 2022 about 400 Elo in rapid, then shot up from 400 to 1000 from start of Dec to April Fools 2023. Then I didn't play much chess, my peak was in the 1130s in September. After that I played some chess at a club but didn't play much chess online. eventually I decided to take the game more seriously and finally got over 1150 Elo. Is there a chance?