I've devoted my life to playing the cello.

Whenever girls have seen me play, they are really interested and get attracted. I've seen really hot girls visibly getting 'moved' and attracted.

I know people will say to play in a band but that's not really the music I like and it's not really a band instrument. So it kinda sucks because I've worked so hard at this and guys who play way easier music in a band meet more girls through music.

It's funny because if I just randomly cold approach a girl, I know she would react so differently if she knew and saw me play. So I figure I should find a way to have her see me play instead of just being a random guy.

I'm kinda at a loss for ideas. Would appreciate any ideas!

Play the cello because you love to play the cello, not because you want to pick up girls.

What you are saying here is that you don't believe you are good enough outside of playing your cello, and that's a problem. That is a self limiting belief that you are going to have to get rid of. You are basically telling yourself "without my cello, I'm just some random guy."

The cello does not define you, nor is it your finest quality. Playing the cello is just one of the many things on the long list of interesting things about you.

Here is a secret I'll tell you: it is not the playing of the cello that these girls find "moving and attractive." It is the passion they feel from you when you play it and the confidence you have when playing. Convey that same passion and confidence when you are interacting with women, and you will have no problems. Practice learning to interact with women the way you practiced learning to play the cello.