Projecct zomboid is a very fun zombie game i play it allot with my friends i can only recommend you to play it with mods you can make this games 1000 times better Link to the game: https://store.steampowered.com/app/108600/Project_Zomboid/
that was the same with us we just started using mods. and also you can change the difficulty of the zombies so its actually fun to playit's pretty mid and boring. ( I play it with friends and have barely no involvment in the game and get quite bored despite expecting to like it )