Brofist for left hand!
Ok so, first off is not about "going better" or "better as over time", is about how you actually plays with, if you feel yourself comfortable with right hand being you a left hand then just go right hand and chill. Same as otherwise.
Is all about you and how you will fit with, is not about you have to do this or that because >"deep lore tablet players".
Just play as you want, don't force yourself to fit with anything you can't feel okay with.
About myself, i play better mouse than tablet even if i used more tablet left or right than mouse over time, the only bad stuff about is that i can't spin as same speed as when i use tablet, in left or right hand i fit more with right, i do more precise jumps, stream control, but the hella pain that it makes me is annoy so ain't gonna play right hand with handpain so haha.
Also to finish it, look:
https://www.youtube.com/watch?v=heIIRNDvAE4 ^o^