reset to factory

I have a vostro core I5 10th gen  Desktop about 18 months old. It came with win 10  I did the upgrade to win 11. I want to reset this machine to exactly how it came to me new. Weather win 10 or 11  doesn't matter. I need guidance in order to be able to do this?  I have backed every thing up and believe I have worked up the courage to do this but I need help  Thanks