Moving from Dev Channel back to Beta Channel and Copilot problems.

Hi Insiders, 

I have quite a big problem, and I hope you can help me with that.

First of all, I was that stupid and changed the Insider channel from beta to dev, and I thought I could switch back at any time, but it seems that is not possible.

When I switched the channel, there was no warning or pop-up saying that I couldn't go back once I changed the channels.

I had the problem that I could not find or enable Copilot in my Windows 11. It was not in the taskbar settings or in the task bar itself. But it was possible (beta channel) to open it with the following command:

(WIN+R): microsoft-edge://?ux=copilot&tcp=1&source=taskbar.

So, it should be somewhere in my system, right? My question is, why can't I enable it?

I read that if I switch to the dev channel and update with the newest update, that problem will be fixed, so I did (maybe stupid, ik).

Now my system is not really stable anymore, and with the above command, only the edge browser opens, but not the Copilot anymore, and I really need it inside my Windows 11, not inside my browser... Any ideas about that issue???? Help is highly appreciated!

The most important thing is that I need to go back to the beta channel, but it's not possible to activate it in the settings; it's just gray. What can I do to switch back without deleting or installing a clean new Windows 11? I can't just install and set up everything again on my laptop.

Is it somehow possible to go back with the system restore function or by deleting the last update? I haven't tried anything yet because I'm worried it will make it worse. What can I do now to go back to the beta channel???? 
Please help me; I'm driving crazy here. 🙏🙏🙏 

Is there any way to do that?

I'm using Build 23620.ni_prerelease.240118-1056 at the moment under Win11.

Please help me with that issue, and is there any idea how to get the copilot back?

Thanks so much,

Daniel