I've been trying to leave Minecraft Beta for weeks now, 

I've done all the steps on the Xbox Insider Hub

Solution A:

• Uninstall and reinstall Minecraft for Windows 10.

Solution B:

1. Re-join the Minecraft for Windows 10 Beta (navigate to Insider content > Minecraft for Windows 10 > Join), and select the Group you want to leave.
2. Once the registration completes, select Manage > Unenroll.
3. Wait an additional 30-60 minutes after unenrollment completes (Pending no longer appears in the Xbox Insider Hub).
4. Uninstall and reinstall Minecraft.

Solution C: 

1. From the Search bar on your Windows 10 PC, type "Command Prompt"
2. From the search results, right-click on "Command Prompt (Desktop app)"
3. From the context menu, select Run as Administrator.
4. Select "Yes" if you are prompted with "Do you want to allow this app to make changes to your device?"
5. In the Administrator: Command Prompt window, type PowerShell, and press Enter.
6. In the Administrator: Command Prompt window, type Get-AppxPackage -allusers *minecraftUWP | remove-appxpackage -allusers* and press Enter.
7. Wait an additional 30-60 minutes after unenrollment completes (Pending no longer appears in the Xbox Insider Hub).
8. Uninstall and reinstall Minecraft for Windows 10.

I've uninstalled and reinstalled it a few times

but every time I start Minecraft, it starts in Beta

Nothing works.

is there any other solution, please help, I can't play online or with friends?