Special Interests and Hyperfixations

I have an autism dx and am inclined to sdx ADHD. Since adulthood I have had 3-4 abiding special interests, but I oscillate between these. One is I think far more conductive to my having a career related to it than the others (it's academic, the others are gaming and fiction related). I had been hyperfixated on my gaming interests for the best part of three years but a recent trip to a university in part caused my hyperfixation to switch to my academic special interest, and I'm planning now on applying for PhDs. I'm worried that stress and anxiety at some point could cause me to hyperfixate again on gaming and I want to avoid this if possible.

Wondering if this chimes with any AuDHD folks and whether they have found techniques for maintain hyperfixations on productive things.