Have you taught yourself?
I found that a couple of lessons helped to identify some poor habits and provided me with lots of material to work on.
One thing that I found transformed by playing was learning to read music, play along to chord charts and improvise. There are lots of ideas here that can help you achieve that. Personally, I believe you'll make faster progress working with someone else, even if it's one lesson every couple of months. (If you don't want to pay or can't, I'm sure someone on here would help you.)
Of course, I say this as someone who used to teach a bass guitar course. But I saw what the regular feedback and structured support did for the players I used to teach. Thankfully, most if them are much better than I am now.