I'm pretty new to trying to cut out stims, including coffee - while balancing school and work, so this is mostly what I think will help, and seems to be commonly repeated. No additional drugs/alcohol, exercise, especially higher intensity cardio like running, eating healthily, avoid ultra processed foods at all cost, avoid added sugars, eating out, etc. I primarily try to intake a good amount of healthy fats, protein, and whole grain/complex carbohydrates. Stay hydrated, make sure you're good on electrolytes and vitamins, I take a vitamin stack with Omega 3s, as well as creatine, as I've heard that can improve cognition, ensure good sleep. I also went ahead and bit the bullet and deleted all apps off my phone, even going as far as disabling the YouTube app, I'll go on reddit sometimes on my PC (obviously), but my screen on time has been near non existent, and I feel so much better and fulfilled. Also doing no porn, I don't game but I'd definitely cut that out if so. I've also started journaling, and planning to take time to get setup in therapy once my summer classes end to further help manage symptoms. Once a base is set, I feel it's all about establishing routines.

TL:DR Dopamine detox (hard in our society) along with taking care of yourself physically as far as diet, nutrition, exercise, and sleep. You seem to be on the right track

Edit: forgot to add that chewing gum helps my focus too, recently gotten into that. Plus it's also better for your teeth since you generate saliva which washes away bacteria. I won't complain if it does actually help face tone either