How do you go wide in deity?

I usually play on standard size continents maps with a more pacifist style. I find that on deity, I usually get sandwiched between 3 civs who all forward settle specifically me, so that by turn 80 my settlers no longer have good places to found cities, and by turn 120 there are no city spots that aren’t -20 loyalty on the continent except for pure tundra and snow cities. This usually results in me missing out on one of (niter/coal/oil/aluminum) and is very annoying.

I try to curb the AI forward settling by setting up cities towards their directions, but with 3 AIs to worry about, I can usually only curb one at a time (and sometimes need to resort to restarting to get a less cramped game).

I often see people talking about 10+ cities, which I’ve never gotten on deity unless I was going domination. How do you manage this?