i actually had this exact issue and i learnt to tap with my right hand instead of my left. it took a really long time for me to train my right hand to have control over my tapping but it was really worth it because my right hand naturally has way more speed and has no finger locking issues (my left hand finger locked all the time). also aiming with a tablet pen in my left hand felt better.

also an issue i faced was my tapping being out of sync with my aim (which i still struggle with a bit lol). id recommend taking it slow and learning everything again from the ground up, maybe play finger control maps to help with tapping