My Ramadan wish to become better

I really want to improve, but it feels like I can't change. My bad habits are so deep-rooted that I'm starting to think only Allah ﷻ can help me overcome them. Sometimes I get really down and think I'll never get better and that I'm doomed to fail. Lately, I've been making dua using prayers from the Sunnah, asking for help, but I worry maybe my duas won't be accepted, or that I'm not sincere enough, or that I'll just stay stuck in my old ways forever. It's tough.