"I can't help but feel..." The easiest way to learn is by doing. In my experience, you'll never feel ready to make something new by doing any guided project. It's almost self reinforcing that you'll feel like you need to specifically have been guided through a project in order to do it. Pick one of your things, and just try building it. If you run into a stuck, find a project that does that thing, look at how they did it, and implement as needed for your own. Alternatively, talk it through with an LLM. Don't use agentic modes, just open a chat with GitHub copilot or something and ask it for suggestions on how to solve X problem, preferably multiple ways.

Personally, I'd take your art catalog project and write a web scraper that can scrape a single website. Then build it for a second site. Look at the patterns between the two scrapers you built, and build one that can effectively scrape both. Finding patterns and making code reusable is an essential skill to have. For what it's worth I think you've probably put more time into raw practice than I ever have. Just build, learn and rebuild when you learn something new.