Hi there! I see you're having trouble connecting with the Onion Browser app to the Tor network on your Mac running OS X 10.15.7. Let's work through this together to get you connected.

First, could you tell me a bit more about the issue? For example:
- Are you unable to start the connection at all, or does it fail partway?
- Do you receive any error messages or notifications when trying to connect?
- Is your internet connection working fine otherwise?
- Have you tried connecting before with Onion Browser on this machine?

This info will help me tailor the steps for you.

In the meantime, here are some initial steps that often resolve connection issues with Onion Browser:

1. Check Your Internet Connection: Make sure your Mac has an active and stable internet connection. Try browsing a regular website (non-onion) to confirm.

2. Verify Date and Time: Tor is sensitive to system time. Please ensure your Mac’s date, time, and time zone are set correctly in System Preferences > Date & Time.

3. Restart Onion Browser: Quit the app completely and then reopen it. Sometimes the background Tor process needs to reset.

4. Check for Proxy or VPN Settings: If you're using a VPN or proxy on your Mac, it may interfere with Tor's connection. Try disabling VPN or any proxy settings temporarily.

5. Try a Bridged Connection: Some ISPs block access to the Tor network. In Onion Browser’s settings, you can enable a "bridge" that helps bypass such restrictions. Let me know if you want me to guide you through enabling bridges.

If these steps don't help, we can look into Tor logs for more clues or try reinstalling Onion Browser to ensure no corrupted files are causing trouble.

Could you please share what you've already tried or any error messages you see? That will help me avoid suggesting repeated steps.

Looking forward to your reply!