Networking/Sharing Files...I've been suffering...

I've been suffering for years. I really need this issue fixed. It seems like when I can get my network and sharing decently fixed something happens and it goes all wonky again!

I have 5 computers. 4 laptops connected via wifi and 1 desktop plugged directly into the modem/router. All computers are Windows 10.

I've had them all on a homegroup, and I've had them all off the homegroup. Yet some computers don't show on other computers so they can be accessed and some computer show but I cannot access them. It's a huge mess.

Let me know what information you need and I'll gladly share.

Can you ping pcs by name and ip for wireless a lot of routers have by default a setting user isolation or simliar which stops anyone who breaks into your wireless from getting to local pcs

Currently the only computer not being seen by other computers on the network is mine which is the desktop plugged directly into the router.
I can see everyones computer in my network folder, and I can access theirs, but they can't see mine.