@JBBJSBB
well, this is pure speculation from me, based on how the story seems to be going but...
I think the MC is going to be a peace-loving person aka your typical doormat until somebody removes that option for him by force.
like... he is probably going to try and have peace talk with anyone who would care to listen, but once you actually attack him he is going to kill every man, woman and child if that is in his best interest.
He seems to be built up to be a "tactical" person who does what he thinks is the best for himself, but is your typical doormat MC because that IS what's best for him as he got better "growth rate" than others and wants more time to grow his empire instead of expanding it by conquest and war because of the risks involved.
( this might change later on in the story if he somehow gets to be stronger, but I find that to be unlikely anytime soon )
That said his people are now evil-aligned and the backstory of the dark elves persecution should help with avoiding the story to only focus on kingdom building.
The other elves are most likely going to come knocking sooner or later to hunt them down eventually, even if the humans fail at it.