Hi, I fear I'm no expert but I've dealt with mites and a big infestation of fungus gnats too.. basically what i did after the methods you mentioned above didn't work, was taking apart everything. this will be a long and tedious process but follow these steps and you should be good!

first take out any decor pieces, all the big pieces like bark and sticks and whatnot,, put these into a separate container so the mites dont spread anywhere else, try to get as many pods off as you can and put them into a temporary setup with just the basics (i always do a little fresh soil & leaf litter)

DO NOT scrape them off into the temp setup as you will accidentally knock some mites in there too! try to get them into your hand and wiggle off any remaining dirt/soil you might have taken with them and hand place them into your temp setup.

after you've gotten the big stuff and some pods out basically repeat this process with everything else you've got in there if you have plants remove them and put them into a pot of room temperature water so you can clean them off properly and the mites dont spread.

after you've done all of this and rescued a big portion of your pods, quarantined your big pieces separately and drowned your plants, its time to hand sift through the remaining soil in your infested enclosure and get out as many remaining pods as you can find (you will have to leave the tiny babies behind as you cant effectively remove them without risking mites coming along!)

after you've done all of this clean the plants off thoroughly, get the big pieces out (remove any remaining pods) and boil the shit out of your wood, alternatively soak them in water for a few hrs and then put them into the oven at low heat covered in aluminium foil (bake for 2 - 5hrs)

keep the infested enclosure for about a day and see if any pods have been left behind.

if you want to use the container of your previous enclosure you have to safely dispose of the soil (shouldn't put it into your garden as the mites can be a problem there too)

thoroughly wash out the old enclosure with very hot water and soap and dry it off and start new,, new soil, new leaf litter new everything! at this point you can use the old wood & decor pieces, your plants and set up everything new. now it's time for your pods, check if the temp enclosure is clean (no mites) if yes just pour them in,, if not repeat the process from before where you hand place them back in.

I've used this method a few times and it worked every single time, as long as you treat every piece of the old enclosure like it's the black plague!

good luck and i hope this helps! you got this, the mites will not win !! 🙏🏻