CAUTION: deleting files from your vault is dangerous. Please be sure to back everything up before doing anything to your vault.

If you want to start over, and are feeling pretty brave 🙏 :

1. Close Obsidian everywhere.
2. Back up the default project file.
3. Back up .obsidian\plugins\tickticksync\data.json
4. edit .obsidian\plugins\tickticksync\data.json
5. Find the "tasks": entry and make it "tasks": [] (ie: delete all the task entries)
6. Find the "fileMetadata": entry and make it "fileMetadata": {} (ie: delete all the fileMetaData entries)
7. Verify that the JSON parses correctly after changes (I suggest going to https://jsonlint.com and pasting the content there to validate it.)
8. delete the default project file
9. Restart Obsidian in one place
10. Sync again.

That should reset your default project file to look like your TickTick...