3
One-shot suggestions
(lemmy.ml)
"Wild Sheep Chase" is my favourite. I managed to launch a campaign from it afterwards.
Murder mysteries are the best one shots imo. And if you like the characters you used in the mystery you can just roll that into the starting point of a campaign, maybe the murder is part of a bigger plot? Maybe certain individuals are not who or what they're pretending to be. Lots of options.