I’m going to give you 2 suggestions to directly address your issues
1) Buy a copy of Mike Downes The jazz bass line book. Great book to work on reading and walking skill, great anaylsis and practice of different ways to approach walking bass line and reading skills.
2). If you have an Ipad, buy a copy of IReal. Its a real book on line that has the rhythms for a bunch of jazz tunes. There’s 1 in particular that totally fixed a 45 year old problem in my playing, which was a poor knowledge of the neck. There’s a song called ii-V-I in 12 major keys. Here is what you do. You play the song on a loop and just play the root note of the chord on the G string, do that until you have the G memorized, then the D until memorized, then the A until memorized, then the E. Once you have each string firmly in hand, then, go string to string with skipping, start on E, then skip to D, etc. Eventually, you should go to soloing or developing walking lines using the Mike Downes book as a guide. In a year, with 15 minutes a day, you’ll be a completely different player. I did this, totally changed me as a bass player, what I play now is more musical. Best of luck on your journey. We are all on the same journey, taking different paths.