Have you as a therapy tried strengthening your core/serratus muscles as a therapy?
I did not see any improvement, (the second time things briefly got worse), but I admit I get frustrated quickly, and did not stick with it long enough. I was never sure I was "doing it right."
Thought about trying again, at home, but I don't know what is safe to try. When this started, I'd bought a neck pain book (written in the early 2000's) that had example exercises. I showed the 1st physical therapist (a PhD), and he said "Oh no, don't do those exercises, we don't do those any more. That will make things worse!". So I'm leery of trying random youtube video exercises... and due to Covid, not quite ready yet to go to in-person PT again.
Brent brookbush is pretty good institute that helped me gain insight with a strong evidence based focus. YouTube channels tend to be copycat videos that really don’t address all the different options and modalities.
Beyond that simply doing more exercise helped, I stopped focusing on my neck specifically after the initial stage. Swimming is great since it reduces load.
I don't remember exactly - but the idea was, if you could feel them bulge in the front of your neck as you lifted your head, you were doing it wrong - you did NOT want to use that muscle group.
(I should have taken notes when doing PT, I wish I could remember all this now)
As general advice, almost everyone these days has some variation of upper crossed syndrome given the way they use laptops and phones, so upper and mid lats, rotator cuff muscles and some neck stabilizers are weak, which leads to slouched posture. I can't say this is specifically the type of corrections you need, but hopefully this useful routine will help otherd avoid such problems (I'm not affiliated it's just a good video):
Changing your habit is another good idea. Standing desk/platform, 10 minute break every hour and walking around, juggling, just moving a bit.
The problem for me was that intermediate stage where the earlier practices stop providing benefit. Which is good by itself, it means the practice worked! But you also are not at a normal healthy level yet.
Working on your posterior chain becomes more important in my experience, like lunges, walking upright and heel-to-toe, and something like foundation training (look it up- really innovative)