Help with app crashing on startup

I have a substantial library in lnreader, 20gb of webnovels downloaded, and 2k + stories in my library, so I am very reluctant to redownload due to lack of backup.

Whenever I open the app, it loads for a while and crashes. This past week, it would take a while to load, but would still work.

How can I fix this? I tried rebooting my phone and nothing works