Who is your target audience? I think this is something that is most likely to appeal to older people, and they’re likely to be suspicious about letting a stranger into their house.

“I am an expert” is very arrogant in BrEng but may work in Norway.

“Too many machines, not enough people” is also glib.

I’d say something more like “I’m good with technology and can help you with computers, printers and TVs in exchange for a cup of tea and a chat: I spend most of my time around machines, but I like to meet people and hear about their lives”. But, again, that’s a UK filter.