+1 to others:
SBL probably isn't for everyone, but don't base judgement on their Youtube channel... Definitely explore the two week trial previously mentioned.
What SBL calls "lessons" on their Youtube channel are really just fluff. The membership content "courses" are much better, set up in a modular format and include quite a few different instructors. Like
@HeadWind, I found enough value to get a lifetime membership when my year was about to expire and they sent me an offer that was only very slightly more than the cost of a year.
The SBL Master Classes are even more in-depth: multi-week courses and each week has multiple modules. I've got several of the Accelerator master classes and have found good value in them (Jazz, Technique, Fretboard, Ed Friedland's Walking Bass, Practice), and feel like my playing/approach has definitely improved.
I've also found good value in some of Janek Gwizdala's instructional books, and he also has
Janek's Bass Studio (but I haven't explored that as of yet). The books priced well even when not on sale, but get on his email list and he usually runs sales around the holidays for 20-30% off.
A good private/personal instructor (online or in person) who listens to you and develops a curriculum based on your specific current skill level and goals is always a good option as well, because there's additional accountability for learning. But it might take some work to find the right one though... I've met some that just phone it in, and/or don't have any form of lesson plan.
5sg.