What can I do to upgrade my set up?

Please don't mind the mess lol

I'm looking to get some design ideas or help with decorating. Especially with the slanted wall. I'm not gonna switch the tech since I don't have the money for it. I just want advice regarding the aesthetics of it. 🙂

I'd love to have some kind of fish theme since im a big fish guy (if you couldn't tell by the fish food on the desk :p)

If anyone would give any advice or maybe even some inspo pics I'd be happy!

Any help is greatly appreciated.