What teaching or training tools are out there for a very average player at no limit Texas hold’em who just wants to get at bit better to a respectable level at a modest time commitment , and does not need to be a pro-level player?
If you want to quickly improve to a proficient level there's no quicker way than to read Theory of Poker and Hold 'em for Advanced Players. Both of these books focus primarily on limit poker, but the concepts are critical for no limit as well. And you'll realize there's a lot more strategy and nuance in limit poker than you thought.
Training videos
1-on-1 coaching
PioSolver (and other similar software)
For any of these to stick, you need to spend some amount of time studying by yourself; just consuming learning material and playing isn't enough.
Applications of No-Limit Hold 'em, by Matthew Janda - this one goes into specifics about how to think on each street, how to build a good strategy etc. Some of the details will be different from the latest theory because the book was released in 2013 but it's still a very solid read if you want to level up.
Applications of no limit by Janda or mathematics of poker are recommended by a different reply here. I would caution that these are extremely academic and extremely dense texts that would be a very tough read for a newer player. Mathematics is less practical and more of a math book than a poker book and applications is Janda showing how to work out solver-like solutions before solvers existed and also contains a lot of math. I think the other two above are more practical and aren't going to lead you to put the book down a 10th of the way through.
After that, perhaps watch some Doug Polk on Youtube to see how he uses the concept of putting people on ranges of hands and what his thinking is in a specific spot.