I suppose you end up in this situation because you didn’t read any of posts from the guides section of this forum.
In there was a dedicated one about how to restore your dead node, that precisely explain 8 methods and steps to do.
Reading getting started with Umbrel guide also could keep you away a lot from these issues.
Reading the troubleshooting manual also can give you more indications how to fix a node that is not starting.
Going straight to “restore from seed” is a big mistake and should be used only when you do not have any other way…
Just restore from seed is not enough, if you had LN channels open. You need also to use a backup of those (see the restore guide) in order to get back your funds.