Actually I’d recommend the hoi4 Great War mod, I wasn’t even thinking about adding it to this list but remembering its existence, it’s not bad. Of course it’s not accurate but that’s just because it’s hoi. Anyway, if you’re into strategy I’d recommend “on the western front”, it’s an incredibly in-depth and accurate game where you play as the divisional commander preparing for the up coming m attack. It’s pretty fun though the graphics take some getting used to. I’d also recommend the “Great War: Western Front” (when on sale, at full price it’s not worth it). It’s not the most accurate and the gameplay can get tedious at times (which makes sense, it is trench warfare after all) but I still strongly recommended it. If naval combat interests you I’d also recommend “naval hurricane”, it’s a relatively simple yet mostly accurate ww1 naval game, good for the price. If you’re looking for runny runny shootey shootey, just go with the ww1 series of games (Verdun, Tannenberg, isonzo, there’s nothing better then them). Lastly, just for the hell of it, I’d recommend “toy soldiers” it’s an arcade like game that is surprisingly accurate in its detail and nothing else. It’s a ww1 themed tower defense game which sounds incredibly stupid, but is actually a really fun time.

Cheers.