I think you are limited by your lack of tactical strength. 2200 rapid rating in lichess should be possible for you within a few months with daily tactics traini

I think you are limited by your lack of tactical strength. 2200 rapid rating in lichess should be possible for you within a few months with daily tactics training. You don't have to be a fast thinker (I would consider myself as slow thinker) to be good in tactics. It's about pattern recognition. So instead of doing a few puzzles where you think for a long time (calculation training), I would recommend you to do very easy tactics puzzles like the chesstempo easy blitz set, where you spend 30 seconds on average per puzzle. This way you can do thousands of puzzles within very short time (few weeks). After some time you will notice that you don't have to calculate anymore for many simple tactics, you just spot them immediately after a few second, because you recognize the pattern. Now, you might still be a slow calculator, but pattern recognition is fast and you don't have to fear tactical battles as much anymore, because you can trust your brain, that'll find the simple tactics with a very high success rate. Of course, there are also deeper tactics, e.g. a not so obvious mate in 7, but chances are high that neither you nor your opponent are able to spot them and you will only know afterwards with engine analysis. That's okay and also happens quite frequently even on GM level.