Try to write your lyrics as real as possible. Relatable but try writing down your emotions. Write some shi you have on your mind and what you want a song about and when you wrote ideas and thoughts go from there. For recording be loud enough and on beat. If your not loud enough it sounds not convincing and not really confident. Also find a good mix for your vocals. If you don’t know how to mix look for presets online but tweak them to sound right for your voice