Wrong shoe size maybe?

Socks can make a difference. Mention that you have issues at the running store. I changed my socks back when I was having an issue years ago and it made all the difference.

I don't usually get blisters, but I get calluses big time. I went to a podiatrist originally for a stress fracture, and he's been working on moderating those calluses. Some of the methods would also apply to blister prevention.

Blisters and calluses are caused by rubbing. Factors influencing how much the skin rubs include the shoes; the socks; your running gait; any lubricant you use; and, surprisingly, how you tie your shoes.

Specific advice about shoes is futile on a message board; different shoes fit different people. I like wool running socks better than pure synthetic. Darn Tough, Smartwool, and Feetures have worked well for me, but Feetures wool socks don't seem to wear as weal as Smartwool or Darn Tough. FWIW, I'd rather wear Darn Tough wool socks at 91 degrees than synthetic socks. Yes, my feet sweat a lot in the heat; but the wool pulls the moisture away from my feet, which helps with the rubbing.

I use petroleum jelly (generic Vaseline) on my toes and forefeet, where the calluses form and blisters threaten to form. It works well enough. I've got a tub of generic Aquaphor, which is 41% petroleum jelly; it seems to work better than pure petroleum jelly for my chest strap heart rate monitor. I'm undecided as to whether it works better than pure petroleum jelly for my feet. Other runners are fond of BodyGlide; I have never tried it.

The lace lock shoe tying technique is designed to keep my feet from sliding forward. It really helps mitigate my tendency to get blisters or heavy calluses on my toes and the balls of my feet. It worked so well for me that I wondered whether the petroleum jelly was still necessary; so I went on a 6 mile run without petroleum jelly and found that yes, it was still helpful.

You probably need a combination of strategies to prevent or mitigate blisters: Get fitted for good running shoes, get good running socks, try the lace lock technique and see how much it does for you, try using some form of lubricant on the areas where you are prone to blisters. There may be other stuff to try as well; this is just what I've found that works for me. Your mileage may vary.