within any algorithm based platforms, this is kind of the only move right now. posting at high frequency on socials, using high trafficked sounds on tiktok, posting on IG stories. there are specific strats out there and the targets keep moving, so do some research and pick the ones that feel the least like pulling your nails out for you.
with spotify specifically, if you qualify for Marquee or Showcase definitely try to do those! otherwise make sure to use spotify for artists pitch to playlists and include a canvas. you can make em for cheap (free even?) on Clipchamp.com.
if you play shows, do those locally as much as possible. integrating into your local scene is a great way to sell physical merch (make your own for as cheap as possible and get creative), and making connections leads to more show opportunities and more people who might check you on streaming or bandcamp - which you should be using since it’s free even if no one buys your stuff at first!
DO NOT!!! use SubmitHub. it’s money you won’t get back and a lot of people on there now just profit off of offering small artists blog placements for sites no one reads and that will not build you an audience. you should pitch yourself on your own to indie curation platforms you like via DMs/email though, that’s a great way to get on a playlist.
overall it’s rough out there but if nothing else you can always post here and these lovely folks might give you a listen!