Yeah, I enjoy Story of Seasons, I just miss the little pixelated HM so Stardew Valley gave me what I want. I'm unsure if the multiplayer mod for SDV is stable, but I've def seen it when I'm over on the Chucklefish forums. I mostly use mods to add in more crops, and to change the portraits of the villagers/bachelor/ettes. Also, the Jas Event Mod which gives her more character development.
Since you don't have a whole lot left to do on the game, I suggest trying out Stardew Valley Siv's Marriage Mod, it adds new events and marriage to characters like Linus, Clint, Marnie, Lewis, Gus, etc. (Also comes with portrait and character sprite changes optional if you want them to look younger, etc.)
I haven't tried it fully yet, but people have been singing it's praises!