Another suggestion:
Switch to a Chromebook.
We were dedicated Mac people but I got so fed up with OS updates, anti-virus updates, iphone syncing issues, running back-ups, etc.
We bought our first Chromebook two years ago and haven't looked back. Nearly maintenance free and covers 99.9% of what we need to do. I haven't opened my mac since the day I got my Chromebook.
If something goes wonky, you just "power wash" it which restores it to its original config. Then you log back in and it recreates everything the way you had it. Downloads all the apps, etc. They release OS updates every few weeks, takes less than two minutes and you're up to date.
I have a really nice 2-in-1 with an awesome screen/touch screen, keyboard, and speakers. It cost about $700 new.
A couple months ago we were back in the US and I bought a cheap chromebook for the house there. $225 and I get 7 years of guaranteed updates for it. Logged in and within 10 minutes my whole chrome experience was up and running. I don't bother dragging my machine back and forth now.
A few warnings:
1) It is not a PC, not a mac, and not an ipad. It has its own swipes, gestures, strengths and weaknesses. There is a learning curve.
2) It uses the Google Play store for apps and you can get great versions of the big ones (Netflix, Spotify, etc.) but can be a bit wonky because it allows Android phone apps to run on the device, which can be kludgy.
3) It does not have great MSFT app support. Yes, you can use online & app versions of MSFT Office but they are completely second rate. Moving to Chromebook really means moving to Google Apps. Which are really good (better than Office in some ways) but it is a another difference. The files app is great for working with Google Drive, but awful for connecting OneDrive.
4) You are officially in Google Land which is great for photos, notes, etc. But if you have some big tech/privacy concern with Google, this is not for you.
Just an idea.