[@End Here]Thank you and I think 400,000 might be still a bit low.
And your current 95k population certainly is.
Europe is roughly 1300 miles long which is a good comparison here for the mainland's length, IMO.
30 men per square miles is considered low end according to the source I linked.
Given the size of your territory I estimate you could easily have 2-4 million people depending on your level of development, fertility of your lands and how much arable land you have in general.
Actriser's not-China is the same.