Write comments in other producers youtube channels. Not on some "follow me I got beats" (unless you dont mind looking like a spammer) but just general positive reviews and criticism, Have the fact you are a producer or you got beats in your youtube name so curious folk will click on your name & make sure you active in peoples comment sections. Not begging for listens, just leaving positive comments and reviews etc.
Do remixes to popular songs or songs you know will be popular. If you got a vibe thats similar to a certain artist, remix their songs and you will get subs by people who love that vibe.
search twitter and instagram for people who put up freestyles or beats under hashtags like #freestyle #beats #producer #flstudio etc. etc. leave good comments, commend the person on the freestyle, flow, or the producer on the mix, what monitors they use etc. & tell em to check your stuff too when they get a sec etc.
Best thing is to engage with people on a normal human level, then hook them in after. If you hit people off the bat with check my beats, they wont check it.
Being social is the key to utilizing social media for your benefit.
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Also hit up fiverr and get some nice beat video images or videos made, if you don't know how to make them yourself.
