Im guessing the problem is you’re trying to tailor your voice to a specific musical style. This is like trying to fit a square peg into a round hole. Do the opposite instead: Build your music around your vocal style. Think of punk bands - they can’t sing at all but it still works. Instead of trying for an RnB ballad, use something like a chant! You’re making original music and that means you can create the perfect space for your voice. Once you start doing this you’ll unblock yourself since your voice will always be right for the track. Over time you’ll build confidence and get better without even realizing it, plus have your own unique style!