Hello

As the database structure of the game changed a bit in that time period - especially around how characters are saved I would have done things a bit differently.

Can you open the old world on a local computer host and make sure it loads their at all- With a new character if need be? I would expect the first time the world loads it would take a while as multiple updates might be being applied.

If that works eventually the you should be able to re use the world! Next step.

You may have seen that cloud saves have caused some debate. To ensure your characters sanity I'd disable that till full release myself before trying a beloved toon in this old resurrected world.

Once your disposable "Admin" character has eyeballed the world for obvious glitches I'd personally recommend you go and use the "Upgrade world" mode ONE TIME to refresh content. Opinions vary on that its optional but what I would do, I sues it flawlessly every time some new goodies come out so I can get the best of them on my 1400 day old world.

Only at that point would I try and upload the db to my server host. The reason being I am now sure that the old world db is in a format that the hosts version of Valheim is expecting.

Good luck!