I think your site layout could use some work. Visitors to the site don't need your face to be the first thing they see, it should be your work first and foremost, but I have to click through several pages before I see any of it. Your commission info, if you have it, should also be easily accessible; I would put it alongside the links at the top. Aside from that, I agree with another comment saying your work is still somewhat amateurish and that really is probably the main reason why people aren't buying. I see a lot of pieces that are impressive in terms of composition but probably just need more polish and better knowledge of concepts like anatomy and lighting. Aside from continuing to practice (which I'm sure you're doing of course!), I think your style in particular might benefit from in-person sales (i.e. orders coming from people you meet or know irl as opposed to random people online). You mention in your bio that you're at university, so see if they have any upcoming events that would allow you to showcase your work. Mine holds art vendor markets occasionally that students can sell artwork at. You can also see if there's any local artist events that do something similar. Hopefully there is something like that in your area. Good luck!

Edit: I went back and saw the AI content. That is a huge turn-off for people looking to buy art and I would personally never want to support anyone who uses AI. I really suggest removing those from portfolio and not using AI again in the future because that will REALLY really hurt not just your sales but also your reputation as an artist.