Spawned in the void

When I was playing minecraft I decided I wanted to respawn the ender dragon, so after grabbing all my valuable items I went on to go and respawn it, but as soon as I enter the portal I notice something was wrong.. after realizing it I spawend in the void, full netherite on everything, all totems, over powered enchantments and my elytra plus stacks of emeralds, this if really unfair and I felt like killing myself, but I didn't. I just want this to be fixed so next time it doesn't happen again, I also want to ask if you can add something to delete saved files and and go back to where you were before your game saved, thank you, bye.