Don't bother upgrading if you are comfortable and don't feel like the mouse is putting you too far behind. I doubt you can notice the latency of a wireless mouse. I'd be more worried about the weight and size of it, and how easy it is to grip. If those are fine for you then keep using it (Which I doubt, logitech mini mouse, fk osu on that).
You should buy a tablet if you want to improve a lot faster, but don't be disappointed if you aren't instantly better, usually takes a while.
You should buy a tablet if you want to improve a lot faster, but don't be disappointed if you aren't instantly better, usually takes a while.