AO3’s got endless material for Jon Snow shippers, but you’ve gotta use the right filters to cut through the noise. I usually start with the pairing tags—'Jon Snow/Daenerys Targaryen' is a massive tag, obviously, but 'Jon Snow/Sansa Stark' has exploded since the later seasons, and 'Jon Snow/Arya Stark' still has a surprisingly dedicated, if niche, following. Tagging is everything; the 'Romance' category plus a specific relationship tag will get you there.
My personal rabbit hole is post-canon fix-its for Jonerys. There’s this one, 'The Dragon’s Queen,' where he finds her in Essos after being exiled—super slow-burn, heavy on the political maneuvering and emotional recovery. It feels like the relationship is earned, not just wish-fulfillment. You find a lot of those in the 'Canon Divergence' or 'Fix-It' tags. For Jonsa, look for 'Season 8 Alternate Universe' or 'King in the North/Sansa Stark' dynamics; they often build the romance out of shared political burden, which can be more interesting than pure fluff.
Don’t sleep on crossovers either. Jon Snow/Brienne of Tarth fics in a modern AU setting have this wonderfully awkward, earnest vibe that’s a total palate cleanser from Westerosi drama. Honestly, sorting by kudos in your chosen pairing tag is the fastest route to the good stuff, but I’ve found some gems buried in the 'Recently Updated' feed for smaller ships.