The external marketing site is probably the key, as well as making the items small enough that the profit margins don't get eaten by shipping and the cost of high quality wood.

I've started an Instagram account where I post some of my work, but I've found out that I'm really bad at social media for marketing purposes. I'm currently debating whether it's worth it to become better at marketing or SEO in order to promote my stuff, but even though it is a no-brainer from a business standpoint, it is the opposite of what I want to do.

I originally started this plan to have a workday where I don't look at the screen for 8 hours, and now I've gotten myself in a situation where I look at a screen in my free time to learn how to promote my business.

You're right, art just doesn't scale well. Maybe it's best if I continue to just do it for fun and gift it to friends and family. Not everything needs to be a business.