I've got 2 I think you should do:
Battlezone (1998), basically a first person view of a real-time strategy game. It's got some base building, resource collection and army building. Not many like it for its time (or any time, really). There's also an expansion, a sequel, a remastered steam version for both, and a mod with a whole new campaign for the sequel.
Mount and Blade (2008), a first/third person action RPG set in a medieval time period. You recruit an army from villagers to knights, man-at-arms, longbow men, etc. and try to conquer the land for your king (or yourself in Warband). There are multiple installments and modules, including complete overhauls to gameplay with mods.
Both are really good games that have pretty unique styles of gameplay.