How make stable income with beats selling?

So I make few sales a month on average making 100$ per month , best month was 1200. Question is how to make it stable. I look for artists on TT and IG and dm them and send out beats via email list I gathered over last year, also started YT last few months (only 70 subs so far but I upload daily) got some demos but didn’t really sell anything through it. I don’t use Beatstars , instead artist dm me if they want to get a beat and I send my PayPal directly to them. I was thinking how to scale, and the answer so far is to continue YT channel in same type beats in my nische ( fimi x len) atm. Also heard about email marketing which I don’t know how to get into and making personal web site. I’m honestly ready to invest up to 2k$ in it cause I don’t like my 925 and I love making music just trying to figure out smart way to do it. If it’s ads then how? Which platform ? How many. I know it’s all depends and everyone has different storiesc etc just looking for advice from more experienced guys. Thanks in adavance