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https://www.novelupdates.com/series/im-tired-of-living-as-an-omega/
I copied and pasted your description into the AI on Google. This is what popped up! Hopefully it's start you're looking for.
Hey everyone I'm looking for a yaoi omegaverse novel. I remember almost nothing about it but i know that the character is supposedly the antagonist omega who picks on the main mc omega who like 3 alphas love, and on of those is the mc fiance or somthing of the body he reincarnated into, then he just like tie loose ends and shit and just move to a rural village to farm and they follow him including the omega who all now seem to be interested in him. Some details may be wrong help pleas, also I remember that the cover is him gardening and he has like blond hair and there are like 4 men in the distance behind him.