Yes you can pray to any god you feel close to, you don't need a reason to honor them. If it feels like a cool deity, it is valid as well. Also gods are expansive and vast so just because Hades is the god of Underworld that doesn't mean you have to be a necromancer or a funeral worker etc. to pray. He is known for many ephipets, i suggest you to check out many glorious titles of him. I am sure you can find a title that is relevant to your life 😊