How were you logged in continuously for years?
For example if you are using Hive Keychain the keys are right there in your browser extension and you can easily extract them.

I entered through the hive.blog website log in function - that was before the Keychain-tool was alive. When the other day I tried to log in through hive, none of my passwords worked, since so many things changed meanwhile - I guess, that was the reason (but not sure).

If you have the master key you need to use it to generate the other 4 keys.

I hope it is the master.

I think technically the owner key can be used to sign all operations but some frontends can have trouble with it so it's better to check if you can change the keys

if I will be able to do that and it works, maybe I should switch to peakd. Since it seems that the hiveblog frontend is not used anyway and might not be administered in the same way ...?