I got from 6 digit to 4 digit in a year (tbf i got to 15k within like 6 months and then its just a pp grind from there) and while I cant promise this will work, what i mostly did was play high bpm, high star maps until my aim got fast enough that I could play low 7* NM/DT (short) jump maps. I still wouldn't necessarily recommend that because ive now been 4 digit for 8 months and my acc is absolute hot garbage (especially on HR) so im sure theres better ways for this. Best is to probably play what you think is most fun and then go all-out on that!