Sorry to hear about the trouble with Lightroom. We're here to help.
What is the exact version of Lightroom and Android you are using now? Did you try rebooting the device?
It would be great if we could see what you're seeing. Please post a screen recording of what's happening, and we will help sort it out. Here are instructions for making a screen recording - https://bit.ly/3Fkf5Vd.
Try signing out and signing back into the account; if it doesn't work, try the next step.
Sync your images and presets of Lightroom Mobile with the cloud, and try reinstalling the software.