Tips on getting into a local?

I’m in the LA area and I’ve been in the industry as a stagehand for about 2 years mostly working for Rhino and Livenation, but I’ve been really wanting to branch out into unions, as the pay and work has been a lot of garbage. I’ve applied for all the ones near me, 33, 504, and 614 with a referral, but haven’t gotten any responses. Should I keep gaining experience at my jobs? What should I do? I know it’s super competitive in this area. And I’m fairly young (20) so I feel like that limits me a lot. Any tips would be awesome.