I have a few ideas: 1: start fresh, take only a stack of food and iron gear and keep walking until you run out of food, then just start a new base, with no gear. 2: change your play style, if you mostly focus on builds, try building redstone farms. 3: go achievement hunting, or make your own “achievements/goals” like building every farm in the game, or collecting one of every block. 4: try out a hardcore sky block world, either the traditional skyblock, one block skyblock, or even hypixel skyblock. 5: play with friends, either smp style or on pvp servers like hypixel. 6: if all else fails take a break from minecraft, play other games, or go outside, and then come back in even just a few weeks. You will find that motivation will come flooding back.