Therapy helped me more than any subliminal when it came to this exact problem
I will tell you why
Perfectionism stems from a lack of self-compassion
Perfectionism is related to a certain egoic notion that we SHOULD be able to do XYZ the very first time with no errors (when you analyze this, the level of pride underlying this thought is staggering)
Perfectionism comes from not being realistic about our true limits and trying to force ourselves to be more powerful/intelligent/prepared than we actually are (aka not accepting ourselves for who we are in this moment)
With more humility, self-love & compassion, and being kind to ourselves regarding what we are actually capable of in this moment, perfectionism can gradually wither away in our minds and hearts
I don’t know which sub would help most with that, maybe LBFH or regular Love Bomb (which Fire told me in a support ticket is actually better than LBFH for feeling loved, both by the self and the world)
Or you could run Emperor Black and bruteforce your way through it. But that will be more painful and violent than it needs to be, because EB will get you to take action while mildly healing the perfectionism, but it will still be there and the recon will be insane (personal experience).