If you're disappointed with the direction The Settlers series is going in, you might want to check out the recently released Townsmen as its quite similar in spirit to the classics. In the most basic terms it is a medieval city-building game where you need to manage a complex economy with deep production chains, construct a variety of buildings in order to further your economy, build up and feed an army to protect yourself from outside threats, and pretty much do most of the stuff you're used to from The Settlers series.
And if you're wondering why I'm constantly bringing up The Settlers comparison, one look at the most recent trailer should quickly clue you in. Have a look:
While I've personally never played Townsmen, the reviews for both the newly released PC and the previously existing mobile version are overwhelmingly positive. Long story short, if you're looking for a game that emulates The Settlers style of gameplay with a bit of a twist, but without much in terms of gameplay innovation, then Townsmen might just be for you. Its probably not going to dethrone some of the earlier Settlers games, but it certainly seems to have the right idea as far as city-building is concerned.
If you do decide to grab Townsmen you can find it on Steam for €10/$10, and this is with the currently ongoing 17% discount. Have fun!