the dev channel is now testing windows 11, even devices that do not meet the spec. (if they were in the dev channel prior to 24th June)
Microsoft are looking at the impact of windows 11 on lower spec CPUs and as a result may alter the minimum specs before release.
Each dev build has a supported life of around 6 months, if you were to prevent the upgrade and continue to run the dev build you are on, support will end shortly. (not recommended)
if you do not want to try windows 11, your only option is to clean install windows 10 and leave the Dev channel.
as a clean install of windows 10 release version is required whether you leave Dev or have problems with windows 11, why not try it. I think you will be pleasantly surprised.
I recommend that you read this carefully before deciding
Preparing for Insider Preview Builds of Windows 11 | Windows Insider Blog