Own your fan list, not just your followers
I learned this the hard way. I had followers on every platform and no way to reach a single one of them without paying for it first. The day I had a show to fill, all those numbers did not help me. A follower is a count on someone else's platform. A fan on your own list is a person you can actually reach, for free, on your terms.
Start with one ask
You do not need a big plan. You need one clear place to say, leave your email and your number and I will tell you first. Put it where your fans already are, a show, a post, your link in bio, and then keep the promise.
Then keep it simple
When I have a show or a song coming, I send one short message. Email for the story, a text for the moment that matters. That is the whole system, and on SolaStage it is built into your site from day one, so you start collecting fans the minute you go live.