500 points advice

So I’m starting into Tyranids as my second army and wanted to start going towards a casual 500 point list. Currently I have Hyperadapted Raveners, a Lictor, Leapers, and a Psychophage. The remaining points I need are in kind of an awkward spot and I’m hoping to stick with recent kits as much as possible. I’m mainly wondering what are the most pressing gaps I need to fill role-wise that use as much of what I already have as possible. Thanks.