Tip on its side, or if it’s one corner of the house angle it downwardsat 45 degrees or similar.
its worth and try and costs nothing but time. If you have an android phone, get the wifi analyser app to see what’s happening.
But as I said before, the loft space is full of moisture and temperature extremes - your kit will deteriorate very quickly up there. If you were able to get some drops made into a closet or somewhere else discreet, to relocate your cable modem and thus enable repositioning of the hub, that will make a bigger and better difference. It might not even cost that much - its only a couple of hours of work.