How to quickly find good areas to backlink?

Gonna tag @roberto_robles here as he's got a load of useful backlink sites you can promote on

Build good things and write good content. Promote it, and the good stuff will at least automatically get some backlinks.

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Find the authority sites in your niche, Check out existing links , Find influencers in your niche, Leverage existing backlinks.

I am looking into hiring someone from Fiverr for this exact thing, might be worth a try to paying someone who knows the ins and outs of backlinks to help you out!