Can't play on my downloaded server

I downloaded my world, but when I start the game offline, I have nothing in my inventory and don't have access to my ender ender chest's itens either, what can I do?

Quote from Roman

Is cracked mode enabled or disabled on your server?

You may have to rename the playerfile in your playerdata folder.

Cracked mode is enable

Inside my playerdata folder I have on .dat files, how can I edit them? And there are 4 different files.

Didn't updated to 1.13, i'm doing everything in 1.12.2

Quote from Roman

What are the names of these files?

Is your personal minecraft account cracked or premium?

File names are: 3e6f7568-aac8-3d6a-bdfe-1b3641698697.dat

a412cd20-0c30-310e-a909-9ac09041ac84.dat

I looked it up with NBTExplorer and found out that, 1 file is my real inventory (the one I play online) the other 2 are friend's invetory, and the last one is my offline info, which have 0 itens.

It's cracked, Shiginima Launcher

I tried renaming the right .dat file with the offline UUID, but it didn't work. It seems that the game overwrite the file

Yeah, seems like it's my only option. Or maybe I can leave everything else inside a chest so I don't have to use gamemode in case I upload the world back to online servers.

Thanks for the help =)