26M Need help in improvement

I am 26M and Want to get 2000 elo and my chess currently 1100 Elo rapid on chess.com, there are some questions I would like to ask Stronger players. Currently I can do good opening making engine bar equal or +0.5, mostly blundering in Middle game or after 10 moves, also with given time I can calculate upto 3-4 moves easily. Questions

1. Should I learn opening at this stages? Or just play and do puzzles, if yes how should actually prepare for it?
2. How You guys analysis your games? Whenever I analysis my games I am not able to get much out of it apart from my big blunders so how you guys are analyzing? And when I go for engine lines I am not able to get the ideas behind it. Inshort what thing's you do in analysis which helps to improve?
3. Also Should I study any book now? If yes then which? And If no then when I can start?
4. How you able to freely following chess notation in split seconds? Currently it take few seconds of delay to locate the square ,so I can't visuilize openings much.
5. Currently Most of the game that I won is because my opponent do blunders,but some time position gets equal for few moves and after that I can find any idea or breakthrough what things I should see in that scenario?
6. I have seen some people make journel and it helps to improve so How should I maintain one? if anyone of you have done it please share your experience how you do it and how it helps to improve.

Apart from this feel free to mention other things.

Thanks😃