What if Austria-Hungary had sued for peace very early in the war and survived as a lesser version of itself?
Basically, Austria cedes Bosnia, Dalmatia, Banat, Transylvania, Galicia-Lodomeria, Trentino, Istria, and Bukovina.
Austria retains Austria (post-WW1 borders), Czechia, Slovakia, Slovenia, South Tyrol, Hungary (post-Trianon), Zakarpattia, and Croatia-Slavonia.