My faith feels so weak lately-how can I turn things around?

Assalamu alaikum. There was a time when I was really consistent with my prayers, all five of them, and I’d even wake up for tahajjud. I was always saying istighfar and reading Quran. I made so much dua, for big and small things, but honestly, I didn’t see any of it come true. It really shook my iman, and since then I’ve been struggling. I know missing salah is serious, but I keep falling into the same sin. How do I stop feeling let down? Like, I ask Allah for something, but I don’t get it, and then I see other people having what I want. It makes me feel so small and unworthy. I get that it might be a test, but I swear I tried so hard to worship more, and my life just didn’t get better. I want to fix myself and come back to the deen. Any tips would really help, jazakallah khair.