That said, it doesn't really give me new tools or tricks to deal with the problems?
It's still the same: podomoro or timeboxing, giving oneself a reward for completing an objective, trying to complete a given task every week, and so forth.
I supposed I could give mental health therapies a try, I guess?
Don't want to play armchair therapist, but that's really the best anyone can really do.
There are exercises you can do, mentally and physically, which can help guide you through self-improvement, but they all require that we actually do them.
Some times is feels like I go years without making any progress with myself. Other times is just takes a small new action to gain remarkable results. Like you, I'm not sure it could have gone any faster and that's okay.
The most important part of that process is continually (once a week or a couple times a month, in my opinion) taking a step back and assessing what is and isn’t working for you, then taking the time to find a way around it.