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I have been playing chees for 2 years and a half and already at 2100 can I become a GM?

their strength depends on your training-rating. So take you time there and get a higher rating. It's only helping your chess if you calculate to the end. If you half-guessing your moves it'll won't be of any use.
@the_loving_boy It's (just a little) funny to see your rating of 1537 (498 exercises) and still hearing complaints on how easy the tactics on lichess are :) Indepently of that concern: try chesstempo.com, worked for me. And just how @Dolg have stated: Take your time, calculate till the end.
Btw I'm playing the OP in a correspondence game. I hope I don't lose ;)

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