Make sure to keep yourself inspired. Look for, listen, analyze and get into different bassists. Find your feel. GOTTA GIT’ YO GROOO0O0O0O0O0O0OVE.
On a more technical level: learn to play without a pick first. As in, play with your index, middle and ring finger. Learn your major/minor scales, and PRACTICE!
And learn the fret-board. (as in the notes of the open strings, all of the fret’s notes as relative to one another, etc.) If you’re familiar with instruments on a technical level at all, you’ll understand what I mean. If not, hit me up and I’ll explain.