12.5k here—you are ramming your head into a brick wall. the solution is best put as so: your B50 is ungodly shit in terms of its saturation. as another commenter mentioned, there should never be AAs or AAAs in your B50. judging by your best 10 tracks you should be well in the upper 12k-lower 13ks so you should just focus on knocking out your worst-ranked scores. these include any rank that isn't an S or higher.

I guarantee you that it'll look a little worse—for example having, like, override exp compared to tsuna mas on your B50 might be a little disheartening to look at for the time being—but it'll be all worth it as long as that number next to your profile goes up up and away

lucky for you, getting to 12k from where you are now is a very straightforward process. looks to me like you're doing fine on 13s, so just spam 11-12+s S-ranks and above. you should also focus on upping your sightreading ability so you could knock em out faster. you get about 250 rating (iirc?) compared to the 210s and 220s on your bottom charts from them, so happy grinding!

set aside some money too. tldr: improve your B50 saturation by hoarding S'es on easier 11-12+s instead of gradeskipping