First get some cool maps, some have interactable stuff on them like gm_mebonix_v3 (I hope that’s right). Don’t get to many weapon mods ccuz it could incourage PvP and on gmod that gets boring fast. Get vehicle mods, like SCars. Get better toolgun tools, some really help with bulding, like improved stacker, smart snapping keypad. If you want you can get wiremod but it’s complicated however there are tutorials. Then just get cool server option mods, like better physic and shooting sounds, and can see you feet that stuff. There is also some cool entities, there was one that enabled a mortal Kombat fight in gmod, that was fun. There are lots more but those were just a few suggestions
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