No connection at home

Im not sure how to feel about this product. We had a 4G Sim, internet was slow even though we have coverage and now we upgraded to 5G and its even worse. at least twice a week I have to move my router to a new area in the house to try and catch some signal. Once I find a spot it doesn't last for long. The router either loses connection completely, (red 5G light/yellow) and then I move the router, even though its green the wifi doesn't work. I called the call centre awhile back and was told I would get help but still nothing. Do I downgrade back down to 4G or is there a solution to me finding the perfect spot in my home?