Hey Marco! Just found the post. Seems you've been at this for a while now and have been clearly working hard at it. These is all really good work.
On regards to the this post, about experimenting and selling art. I'm probably not qualified enough to speak around "selling" art myself, however for what is worth, if I wanted to sell art, my two cents would be to go through popular forums (for example, Genshin Impact in reddit), see what people want to see, then post things you know are bound to bring attention, and potentially, clients.
When it comes to commerce, it's all about offering what people are willing to buy. There are also forums where people will tip with specific requests. Persist on your own marketing, and without doubt, clients will appear.
This should let you get some commissions, some experience, and you can then work your way from there, never losing focus of your own value (since clients are bound to haggle).
That is, of course, if it's about selling. Personally, I do digital art simply because I enjoy it, if people were to eventually like it enough to donate/buy things, great, but if not, I'm fine with it was well, since I'm doing it more for self satisfaction, for experimenting, and not really for the monetary benefit of it.
It's all about circumstances and what your goals are.
I'm curious, you started off pretty talented already, and have only improved. What term are you on currently? I'm just in term 2 myself. Still got a long way to go.
Whatever path you choose, make sure you are enjoying it, wether that's getting the satisfaction of successfully completing a commission, or the satisfaction of sharing art you enjoy to do.
Edit: fixed a lot of typos.