Support
Write to help@bobara.app.
One person answers. A few days is typical. If you have not heard back in a week, write again.
There are no accounts. The collection lives on the device and, if you are signed into iCloud, syncs through it. Nobody answering mail can restore a lost collection, because there is nobody at the other end of the data.
If something is broken, say what you were doing, which device, and which version of iOS or watchOS. A screenshot helps. If you installed from TestFlight, that feedback channel reaches us too.