I once had three cities. 2/3 of the got the services 2.0 update, and my third city - the level 99 city had yet to get the services 2.0 update. I was stressed out about it, and then the change of season passes to three weeks just sent me over the edge. I calmly deleted all three cities nearly a week ago.
I don't miss the game at all. I have a lot more free time suddenly and it's nice to realize life still exists and I no longer have to think about grinding to keep up in the CoM.
Best recommendation I can offer anyone is to just delete your city / cities and just enjoy life. There are other games out there. It was hard to let go, but I can breathe again.