LOL, what kind of vpn do you have? Mine always autostarts and connects seconds after turning on my Z11, then i just need to open MOL3. That's not hard...
Anyways, there is an app (not sure if it will work on Android 11 because it shows a message of compatibility issues, works on 10 though with the same compatibility message) called "AutoStart - No root", it does what you want, it auotstarts more than one app and has delay settings...
Thanks, I will try.