As I think about it, I don’t consider candidate moves very often. I typically analyze what’s in front of me and make the best move from there. Your suggestion is very good and appropriate, and something I will definitely work on.
I’m grateful to you and everyone else who’s given me advice.
Just glancing at a few of your recent games, I'd say you play quite decent chess. I would not feel discouraged, in your position.
Some of your opponents played much better than their ratings. A few of them actually used engine assistance against you. This, unfortunately, can leave you with the illusion that you're much weaker of a player than you actually are.
Though, judging by some of your blunders, I'm left wondering if you're aware of the concept of "candidate moves".
These are moves that you consider, when thinking about what to play.
Normally, casual players will look hard at a position, ponder the threats (or possible) threats that they see, then they will decide upon a move and play it.
But more experienced players tend to consider "candidate moves", which means going beyond that initial move and considering other options.
As a general practice, whenever I decide upon a move, I then force myself to STOP and then: look for A DIFFERENT move.
Or, in proper terms: to find another candidate move.
Try to do this on EVERY SINGLE MOVE, no matter how obvious the best response may seem. By doing this, it will force you to do two things:
1) It will force you to slow down - as rushing and playing too quickly is often the cause of many of our mistakes.
2) It will force you to reconsider, and to think about other options. This can help us break from from the narrow focus that we sometimes get, in some positions, that causes us to get stuck on only one single idea. Sometimes this means we keep trying to get the wrong idea to work. In many positions, we have to accept the possibility that this idea isn't correct, and to look for a better one.
In short: try to consider at least 2 candidate moves, every single time it's your turn to move. Make this a mental habit of yours. Stick to it. This will not turn you into a master overnight, but it can certainly be a step in the right direction, by giving you better mental discipline at the board. Hopefully, you'll find that some of your more simple mistakes will start to fade away ...