Hi there! I see that your Angry Birds Journey app is crashing, and you'd like to get that fixed. To help you best, could you tell me a bit more about what happens exactly? For instance, does the app crash right after launching, during gameplay, or at some specific point? Also, have you tried any fixes so far?

Meanwhile, I'll guide you through some common steps that often help resolve app crashes on macOS 10.15.7:

1. Completely close the app: Sometimes the app might have background processes running that cause instability. Press Command + Q or right-click the app icon in the dock and choose "Quit" to ensure it's fully closed. Then relaunch.

2. Check for updates: Make sure Angry Birds Journey is up-to-date. Open the Mac App Store, go to "Updates," and update the game if available.

3. Restart your Mac: A simple restart can clear temporary glitches or memory issues.

4. Clear temporary cache/data: Unfortunately, on macOS there is no direct "clear cache" for apps like on mobile, but you can try deleting the app and reinstalling it to reset app data. Before reinstalling, you might want to back up your account data if you're logged into an account so you don't lose progress.

5. Check storage space: Low storage can cause apps to crash. Click the Apple menu > "About This Mac" > "Storage" to verify you have sufficient free space (ideally >5GB).

6. Check your internet connection: Angry Birds Journey can sometimes crash if the connection is poor or unstable. Ensure you have a steady Wi-Fi or wired connection.

If you've done these, let me know which ones, and if the crash happens in a particular scenario. Then we can look deeper, such as examining specific error messages, checking macOS activity logs, or trying to run the game in a different user account.

How does that sound? Would you like to start with these steps?