I really enjoyed playing Wargroove asynchronously when it first came out. If you haven’t played it, it’s basically an homage to Advance Wars. The multiplayer maps can be a little hit or miss, some are definitely lopsided in favor of the first player without any compensation for second, but it’s been a while since I played so maybe there are more better maps.
Twilight Struggle is a board game you might have heard of but there is an excellent digital adaptation which supports multiplayer with correspondence play. It’s a Cold War themed card driven game, where each card will have a historical event on it, that either the US or USSR have to make the most of. It’s very good and deserves it’s reputation.
Just in case wargames might be your cup of tea, I would be remiss if I did not mention Empire of the Sun. It’s another card driven game like TS, this time about the Pacific War. There is no digital adaptation but there is a stupendous Vassal module which has the designer’s blessing, and the experience of playing it via email is probably the best asynchronous multiplayer experience I’ve ever had. It’s a bit tough to get into but there are a lot of good tutorials out there. Rob Zacny talked about it on a WPR and 3MA.