I got HPPD a year ago from ayahuasca and 10 weeks after that I got very bad DP/DR after messing with aya again, after images would last minutes, impaired motor function. existential thoughts, visual snow, macropsia, everything looking unreal, etc.
I've reached a similar place as OP, all symptoms have decreased to a manageable level and life bears more resemblance to what it used to be like.
I've exercised everyday but also drank beer and smoked weed throughout, I had mdma and speed intermittently and I recovered at the same rate as when I stayed sober even though getting intoxicated exacerbated symptoms.
I avoided anti depressants or any other pharmas.
My diet stayed the same, I had a spell taking 5-htp and other vitamins but not sure they did anything.
The best thing ultimately has been sleep and time.
I've only ever tripped on smoked dmt and ayahuasca, no acid or mushrooms.