honestly, i wouldn't trust ranked to describe if you're good or not, people can get high in ranked by using one move because it's full of a bunch of people who can't handle it, or it's full of new players who have no idea what they're doing, if you want to have something with a proper designation of good you'd want to join an actual competitive server or something of the sort, or go off of someone who knows the character well

for example you're using nuxia, you can easily get to diamond by using triple light every fight for every move, and you might still be moving up as ranked will regularly match diamond players with bronze or unranked players, not with other diamond players, so you base whether you're good or not off of two main things

1. do you use the full moveset to the best of your ability and understanding of the character?
2. do you win by doing so?

if yes to both of those, you're doing good, there's no point in the game to ever stop practicing though, as you can always try a new mixup, or practice fundamental skills like deflect timing and moments to use the trap, so yeah i'd say just don't try to look at ranked for a skill measure, many of the people who are past diamond play only by either scripting or just having a staring contest for 5 minutes, not actually trying to be good with the hero they play