The music industry might not be as strong as it was in the 80s, but there are still plenty of ways to make money online as a musician. Sites like SoundBetter let you sell your services as a songwriter, producer, or session musician to thousands of customers a month. While Musicbed, Music Vine, Marmoset, and SongFreedom are perfect for licensing your music to TV shows, movies, and web series.
Once you have that problem or need nailed, the next step is to validate that idea and make sure you’ve actually got customers who will pay for it. This means building a minimum viable product, getting objective feedback from real customers, incorporating updates, testing the market for demand, and getting pricing feedback to ensure there’s enough of a margin between your costs and what consumers are willing to pay.
Wealthy Affiliate focuses on getting organic traffic through Google, using content as the main driver. Sounds like you have that down with your website already. Though if you are struggling to monetize 100k visitors a month, my guess is that you are not creating targeted content, and you are not creating content that lends itself to sales. I would work on doing more research about topics related to your niche, and see if you can find some keywords with more “buyer intent” that relates to your niche!