It seems yesterday's maintenance of the Galatur server caused some players to completely lose all their quests and be unable to continue with the story, and Amazon are aware of the issues and working on a fix. You can submit a ticket and get your issues resolved directly that way as well.
Missing Quests (Source)
Right now CS will be able to fix this manually if you submit a ticket. We are also looking to see if a broader fix can be put into place, but in the mesntime please submit those tickets and know it will get addressed
If you are experiencing issues with your account missing the main story quest or other missing things as a result of the downtime please submit a support ticket and provide your character name, explain you were on the Galatur server, and outline what is missing from your account. The team will verify the info and will try to help restoring the missing things. Contact Us | Amazon Games 255
Source: News Latest Topics https://www.icy-veins.com/forums/topic/64166-lost-ark-galatur-server-maintenance-missing-quests-issue/