[nanhaubam]

I'm thinking of starting a new adventure with my group of friends, what do you suggest for a group of six players?

[MoistOctopussy]

Depends on what kind of adventure you want to run.
I'm guessing it's 5e, and for that I can recommend Tomb of Annihilation if you want to give them an unforgiving but very exciting romp through the jungles of Chult,
Waterdeep: Dragon Heist is also highly recommended. If you want them to have fun around the city.