2000 in rapid is the end of my chess life

Im 30 year old now. I played chess for 3 years and heavily played for 1.5 years.
I solved a tremendous lot of puzzles (yes, I train with chesstempo but not chess.com) and more often review a losing game than not.
Recently I got Rapid-2000 on lichess, and stuck 2000-2100 there for 1 month.
I think i can get there soon on chess.com.
Although growing fast, but I meet a tall barrier.
I often build up advantage with mostly best or book moves in the opening 10-15 moves.
When I win, it's often because I kept the advantage to the end.
When I lose, I often lose in the midgame shuffling due to insufficient time and subsequent blunders.
I think I'm like an old CPU with 2200-rating level of opening and strategic play, but 1300-rating level of process speed, the latter is so hard to grow.

I think it's because of the age.

On the contrary, I played go(baduk) since childhood. I was certificated as 4 dan amateur through a first place in tournament 10 years ago, and never played a OTB tournament again. Despite not touching go for years, I can still easily beat 3-dan-OGS or 6-dan-Fox through a midgame chaotic fight.

I think I missed the best time to learn chess, and will end at 2000 in chess. I will never get to somewhere expert (2200 lichess) not to say FM (2500-2700 lichess).

Staying at such level of chess is quite awkward, no family nor friends play with you, and you don't get a title.