I’m not a full-time pro, and I don’t expect I will be soon, but what I would do (and am starting to do) is get in good with some labels (our own netlabel included). That is putting me in touch with the people who might need my skillset in mixing/mastering to help them make the best stuff they can, and bonus if it happens to be in the genres I specialize in. I’m getting to look over the shoulder of these very skilled guys and see how they work, which has made me a better producer when I find time to work on my own stuff.Things have taken a turn now that I’m on the label team here, I owe it to this place to be a bit more committed to making IDMf the best it can be than I am to making me the best I can be (though the two certainly go hand in hand). But suddenly I’m getting management and leadership experience that a lot of young engineers/producers are not going to have, so I’m excited about that.
For you, I’d say look into where your scene is, whether that be local producers’ soundclouds or club nights hosted by particular labels/artists, and be there. Let them know that you are a serious engineer and you can make whatever they’re doing better and ask for a chance to prove it. You’ll probably have to work for free for a bit to build up a reputation that you’re worth what you want to ask (I’m still mostly in that stage myself). And be open to trying things you didn’t have in mind.
Fun fact, I made my name in IDMf and have gotten where I am today because the netlabel needed a mastering engineer for IDMf 048 and I stepped up first. I had mastered my first song that I thought sounded better when I was done with it than when I had started two months before that, and had never mastered any song but my own. I did a good enough job that they asked if I could do some of the albums after that, and I had enough fun doing it that I said yes. I’ve had to turn down other opportunities, like playing live locally, and I’m always really bummed when I have to turn something down, even if it doesn’t fit super well with what I’m doing, because I want to learn from as many different corners of music as I can. The more open to work you can be, the better, but it sounds like you have that covered.