Playing D&D? Awesome. Playing 5th edition? Excellent! Worried about betraying your friends and family by checking out another edition of the same timeless classic game? Don’t be that way! Be a scholar. Every OGL game expands the depth of the hobby as do war gaming rules from Warlord and Osprey!
Don’t overlook the superb writing and production value of Pathfinder. You may not like the complexity of 3.5, but as an OGL variant, it is an incredible source of inspiration for your game!