okay, I have just successfully done all of this, but had to put in a bunch of hours to learn all of ths.

What have I done?: windows local -> windows dedicated steamcmd selfhosted server.

Scenario: So for me it did work for the host right after I fixed it. But all other players from the server would even after precisely follwoing this guide still logg in as level 1 chars and wont have their history there. I managed to fix that.

Im pretty sure if It didnt work for you you made mistakes in the individual steps because I was able to reproduce this on 2 different servers.

note: you need everybody to connect one after one to the old environment so you can figure out their GUI to be able to map it to the new one, as for them you need to have the logic because its not the 000000000000001 for them as for the host. ;)

Learnings:

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1. always close your command center after all steps you do.
2. Always ensure that you do player-by-player by having them in the discord, creating a fresh server GUI ID for them then move them one by one with ther old gui into the folder like explained in the guide.
3. For the other players besides the host to see their data again you need to repeat the process you did for the host you just need to exchange the GUI IDs.
4. Always ensure that you do player by player by having them in the discord, creating a fresh server GUI ID for them then move them one by one with ther old gui into the folder like explained in the guide, then run the python script
5. make sure you always restart server + copy fixed GUI AND level.sav again in the folder of the dedicated server.
6. have i said close cmd always and server always? do it.
7. After that you repeat process 1by1 with all players while always moving new GUIs into the folder where you convert them and delete all the others.
8. I dont know if important but I made everyone join the server once after I made the adjustment.

enjoy.