Sounds like it is all you, which is a bit pointless, as does the fact that you are hardly playing, which could be another factor, if it isn't all you.
If the chief isn't playing, there is not much reason to stay in such a clan as it's all work and little to show for it.
If it is all you, just try logging in to your ''clan'', other yous, you may find they are still there, and you can reassemble ''the clan'' .
Sounds like you accidentally clicked on "Disband the Clan".
I am not sure what you mean by gradually building up the clan - perhaps just starting a new clan will get you back to where you were. Otherwise try a message to support, they might restore the clan for you.
https://vikingsweb-support.plarium.com/web/en/tickets?game=vikings
Wow, that sounds incredibly frustrating! Putting in all that effort to build up your clan, only to find it gone when you log back in, is a total nightmare. I’ve seen similar issues happen in other games, and it’s usually a glitch or sometimes an account security issue. Have you tried reaching out to the game’s support team? They might be able to restore your clan or at least explain what happened.
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Hope you get your clan situation sorted out soon! Good luck!