I mostly tell my people "We aren't going to do that yet - or possibly ever - but keep in mind that we might have to if we ever win the user growth hockey-stick graph lottery, so when choosing between options of how to architect things, prefer very narrow focus that _could_ be pulled apart into microservices more easily if practical"

I've also been known to stand up duplicated instances on a monolith with path routing on the load balancer as a "pretend microservices" scaling or upgrade trick.