I know this wasn't directed at me, but I'm in the same boat, I don't have shrink issues. Almost all my clothes are 100% cotton (dress shirts, cotton pants, etc.) and I don't have any issues with shrinkage, I dry on low heat and then iron for a nice crisp look.
Maybe it's the low heat? I have to take my clothes down to the coin laundry in my building. It takes extra long for clothes on low to dry. It sounds weird, but I won't sit around the extra 20 minutes more for clothes to dry on low. I'd rather take them upstairs and hang them to dry than to sit and wait.
Sometimes, like with jeans, I will put them in the dryer on low for 20 minutes so they will dry faster, once I hang them up. But, I never let clothes, like jeans, or cottons that I don't want to fade or shrink, to dry all the way in the dryer. It is the
heat at the end of drying, combines with the abrasion of tumbling, that shrinks the fibers together.
I've done some felting of wools for craft projects. Making felt is taking loose wool fibers, soaking in hot, hot water, the rubbing and abrading the fibers so they tangle, grab and shrink together into a thick felted material. It is the heat & abrasion that shrinks up natural fibers. If you've ever pulled out a formerly adult size, knitted wool sweater from the dryer and it is toddler size

, that is the process of felting.
Here is a loosely knitted wool scarf. You can still see how the fabric was knitted.
After the scarf was purposely thrown in the dryer to felt, the fibers have shrunk & tangled together into a solid piece of material and you can no longer see any knitting:
Similar shrinkage happens to cotton & some natural fiber clothes because of heat, but the fibers don't get so tangled.