I found it head work to get to 20k. When I broke through to 19k it was a big deal for me: I had thought I’d never beat those scary 19ks !
So 20k is a real achievement… And you have already out-survived many many who dropped out without getting that far.
My experience was that there are a set of clear things that get you to about 19/20k. I wrote these here:. Your beginnings with Go?
You might like to make sure you have that covered.
After that, I had to take a new track in learning to make a fresh burst of progress. I did two things. First I soaked up dwyrin’s “back to basics” series on YouTube. Then I played in a fast correspondence tournament trying to apply that stuff. Playing lots of games in a burst, knowing you can’t really expect to win since you are the lowest rank and therefore aren’t worried whether every move is going to lose the game… Powerful learning environment.
Now I plateaued at 14k looking for the next key to a burst…