A lot of good suggestions already here. Try to eliminate the mosquitoes in your house as much as possible. I installed mosquito nets on my windows a few years ago. This helped a lot. I am now asking myself why I haven’t done this before. But I do still get bites like one or two a day, because I also like to be outside in my garden and sometimes a mosquito still finds a way into the house. So there is no way you can prevent all bites. But the good thing is, you can treat them really well really easy with heat! I do this when I have a cup of tea. I just press the hot tea cup on the bite for a short while. But there are also special devices called electronic insect bite healer or something similar. They work as well and are probably safer and easier to handle. Heat does disintegrate the anticoagulant that mosquitos inject and that makes the bites so itchy. The bites I get itch only ones. Then I treat them with heat and they are basically gone. Try to not scratch because you might spread the anticoagulant more. Just treat them right away!
I also use Proton VPN as well as Proton mail, Calendar and drive (proton cloud storage). I am also on arch and quite satisfied with Proton.