I started playing osu! to train indirectly for FPS games, but I ended up liking osu! more.
I have low 4* weaknesses and low 6* strengths. My biggest weaknesses are slow cognition speed and bad pacing. Compared to the rest of my skillset, I'm excellent at jumps and alternating. I'm training with maps that match my weaknesses.
I can't train earnestly for a while -- the mice I have are barely alive.
Settings:
Monitor: 60 Hz. I won't upgrade to 144+ Hz until I stop being poor.
Favorite mouse (so far): Katar from Corsair. The simple shape allows fingertip grip even when using ring finger for right-click. However, mine started having input problems after a year of use. It has 20M click durability Omron switches (not a good thing).