Yea, the game might have some weird mechanic with rank cutoffs, where you usually end up seeing requests from people of similar rank. A lot of the time, I never see low level players' requests for whatever reason, but when you're on a lower level'ed account, you can see all those requests pop up then. It kind of sucks for high ranked ppl as well, since people at my rank don't normally share raids since they're just AAB solo'ing them most of the time. Even the ones that get shared are often killed in a minute or so.

Anyway your best bet is to keep opening the raid to ALL & Friends and also refreshing the send requests for those every 10 mins if you're on. The other option being to join an active union that can help you with things like that.