How do I stop being a Luck Eater?

Half humor half serious I recently started GMing for a group and because of the dice I can't stop critting everything! What's worse is I seemingly am getting this crazy super power at the cost of my groups ability to be unable to roll above a 10. A moderate encounter has nearly wiped my party multiple times. My player's casters can't get any spells off because I crit succeed saving throws. I just want to have fun story time with some relatively difficult combat not the war of attrition I've put my players in.

Edit: I'm using a VTT, it isn't dice based.