... I learn based on motivation. During the lockdown I tried, twice, to sit down with an instructional book and brush up my reading in the bass clef. But because I had no practical application for that at the time, I was not motivated to continue.
Right now I'm doing that same study in that same book because I do have motivation - I'm starting a new course of study and I want to be able to read efficiently enough to not waste too much time. So when I have a good enough reason, I do things.
Now, one could say that being able to read can help me learn music that I want to play, which is a practical application, but my ear will always be faster than my eyes on this so for a lot of people that's probably true, but it's not true for me. I can already read well enough to know that a lot of the transcriptions I do look at are wrong, though.
Well, I'm certainly not willing to die on the hill of music notation, but I'll point out that you already know how to read music; you're working on your SIGHTREADING which is a different, but related, ball of wax.
Heck, I'm a pretty strong reader (in North Texas I'm considered only mediocre, but in Boston I'm considered a very good reader - those guys out of NTSU set a hell of a standard), but if I get a call for a job that I think's going to involve difficult sightreading, I pull out the books and set up the gnome and start plowing my way through, yet again, just to hone that skill for the upcoming gig.
I bet right now that if I ask you what's the note on the highest space in the bass clef, you'd get "G" pretty much right off. Maybe you'd scuffle if I handed you an Oscar Pettiford solo transcription - like 99% of all bass players. But again that's orders of magnitudes away from the person who insists on not learning even the basics of what notes go where and what they're called, or what the 1, 4, and 5 are in the key of B.