I created a Facebook page, and shared videos, and links, and boosted the posts. I've shared posts on music related pages, such as Billboard A&R, and shared videos on Twitter.
The most effective methods, is paying freelancers on fiverr to promote my lyrics videos, and paying the UK Talk Radio Station to play my music. I avoid paying anyone to boost my Spotify links, because if it turns out to be bots, my releases will get taken down.
Always read customer reviews before making a purchase! There are some scammers on there There are also a lot of absolutely brilliant sellers on there, who have helped me to get my music discovered.