How to transfer authority from a microsite in a different domain, to main site

I am thinking acquiring a 1-page microsite (a mini-saas) with a lot of good quality, relevant backlinks, to help the SEO of my main site.

I can’t move/301 the microsite to my main site because the microsite domain does matter.

What is the best way to transfer or share the authority from the microsite to my main site?

For example, would a single link from the microsite to the main site help?

submitted by /u/qch
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from Search Engine Optimization: The Latest SEO News https://www.reddit.com/r/SEO/comments/mjuivi/how_to_transfer_authority_from_a_microsite_in_a/>