But when it's raining or darn cold, what use is that?
The thing about mobile broadband, max, is that it is highly variable depending on location, provider, weather and mast deployment. It isn't anything like even ADSLx or FTTC coming over fixed links.
It's more like comparing a helicopter to a fixed-wing plane. Different tools for different purposes.
Nobody can help you, nobody can advise. Because nobody is where you are with your equipment.
Connections: OnePlus 8 Pro on Three 4+ (LTE)/5G and at home Three Mobile, with (Three)ZTE MF286D router giving about 113/20Mbps.
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“I have hardly ever known a mathematician who was capable of reasoning.” (Plato)