IMO the last thing you need is to try and get more technical.
This may sound weird but one of the best things you can do to prove to yourself that you've actually made much better progress than you imagine is to get together with some musos.
It will be a scary thought given that you feel you haven't made much progress, but do it despite that. You will also find it will get you focused on what you need to really concentrate on.
Keep it very simple, don't try and get fancy or complicated. Listen very carefully to the drummer and try and work in with him.
Always remember that 'less is more' when it comes to bass playing - more often than not.
Practice wise, google for some lessons that show correct hand techniques or but the book 'Bass guitar for Dummies' ( and don't be put off by the title )
Also go
here to Libster Bass for some good advice and easy to follow structured learning.
All the best.
Mo