There are other variables in the band situation that you have no control over, not least you are listening to the band who will not be consistent. Stating the obvious, you will respond to their playing. As an example, in my 3 piece we play a be-bop 12 bar number. Bpm is surprisingly critical and quite narrow in range. Outside this range I have to change what I woukd ideally play. After 54+ years of bass playing I accept that I am not perfect, I make mistakes, I get things right, I improve, sometimes I am way off, sometimes I am really good, and I find some stuff hard. Most importantly I play to have fun and enjoy the shared experience. My 2p, focus on the enjoyment of music, let the rest come from that.