yeah sure. there's the connection level of each knot itself, with higher levels giving you more chiral bandwidth and i'm pretty sure gives you higher numbers of online structures in that area too, but i'm not certain about that.
other than that tho there's bridge contracts which state they give you a stronger connection to that player so you both share more of your structures with each other. i actually forgot about that until the last few days and after adding the max 30 contracts i def have more structures.
i also suspect that if you like online structures actively rather than just letting it get a like when you use it the game gives you more other players and structures as well, but i'm not certain on that one either. it makes sense to me what with the 'likers get liked' sign mechanic and how the amount of likes you can get overall is a skill to improve as well as your time to give likes increasing with skill as well.