how to see tactics

Dear ANoteableOpponent,
I wrote an article about the topic what you're asking about. It's really important to learn the right calculation method, then you need to practice it a lot through solving puzzles and as you learn more and more patterns, your tactical awareness will be sharper.
You can find my article here: https://chessgate.us/calculation-principles/
If you have any further questions, don't hesitate to write to me in private or in email (you can find my email address on my profile). I hope this is helpful for you! Good luck with your games!

It sounds counterintuitive, but play slightly faster games — like 10+5 or 15+10. It forces you to manage time better and develop intuition.

I guess the typical answer would be "puzzles". You haven't done any. I'd maybe give them a try. Please note, it's not going to lead to instant understanding of tactics.. It's going to take dedication. But eventually the puzzles help. You get better at solving them and you are able to more easily see tactics in your games.

There are 5 free puzzles for day. That's a lot more than none. If you spend time on those puzzles, trying to really solve them, 5 per day should be enough.
The other way to get better at tactics is to analyze your own games (especially lost ones) and try to figure out what were the biggest mistakes on both sides.
(Just to be clear, "analyze" doesn't mean "push a button and that's it'. It means: go through the game, with or without the help of an engine. You can safely ignore small mistakes, but try to understand big tactical mistakes.)