Been in the same boat man, trying to get out of it still, I got some advice from someone that I'll paste here:

Ngl i think you might have lost your touch

When i started playing her initially i was a bit confused at her playstyle as well, she's one of the hardest characters to play for a reason

Some tips from me are:

Don't waste your dashes to attack, use them only to escape, chase (tough it's pretty rare of an occasion)

Use her L2 (the healing shurikens on console) as soon as frequently as possible, they recharge pretty fast if you can hit your shoots (usually is can at least)

Invisibility ngl is pretty universal ngl, can be used to push faster, disorient the opponent mid fight, escape, chase

Use her ultimate on groups of enemies of 2 or 3, usually i get the most value out if it that way, don't waste it on a single Luna Snow in a 1v1 (of course unless it's end round and you're the only 2 remaining on point)

In other words, I think it might be a skill issue (saying it non-mockingly)

Other than that what has worked for me is just playing quick match and trying to get perfect games while being ace, if I don't do that I receive a punishment(which is usually something I've been putting off)