This is super niche is my feeling, not going to be super easy. Musicians are a niche, those that use these visuals is a niche within, those that will like your particular style is a niche within.
That said, I'd guess that business managers are a waste of time. Musician's themselves are typically accessible on social these days. Make them custom art for their music and share with them. Probably only a small clip is needed, something to get their attention and hopefully reach out to you for custom work. This is where you can charge bigger prices.
The patreon approach is a great start but unless you really can build a huge following it's going to be hard to make it add up to to a greater sum. Prove me wrong though!!
I don't see them as competing strategies, do all of it.
Patreon probably will give more dopamine hits as you get to feel like you're building a community as seeing it grow. The musician approach I assume is a hard grind. Months will pass with hours invesred and no conversions, so probably has a higher give-up rate. I'd do both. I'd also set some traction/revenue goals as I can see this turning into more of a hobby (earnings/time is very low)
That said, I'd guess that business managers are a waste of time. Musician's themselves are typically accessible on social these days. Make them custom art for their music and share with them. Probably only a small clip is needed, something to get their attention and hopefully reach out to you for custom work. This is where you can charge bigger prices.
The patreon approach is a great start but unless you really can build a huge following it's going to be hard to make it add up to to a greater sum. Prove me wrong though!!