When my brother was burnt out on DMing our online group and asked me to consider running a campaign, I looked over my big adventures that I had an interest in running at the time and came up with the following list for the group's consideration.
1 Rising Shadow in Middle Earth
2 Investigations in Pirate City
3 Completely Not-Haunted Funeral of Professor Jones
4 Starts off with Goblins
5 Plagues, Riots, More 2020 themes
6 Meteor Strike
7 Efreeti Aladdin
8 Ancient Dungeons
9 Baba Yaga and the White Witch
10 Punch Demons in the Face
11 The Mummy
12 Thundarr the Barbarian
13 Maquis in Devil-Nazi Land
14 Doctors Without Borders
15 Tatters of a Play
16 Masks Around the World
17 Dark Shadows
18 Spawn of Pulp Action
19 The Lothian Express
20 Chained Coffin in the Holler
The system was going to be 5e (even though most of the adventures would be conversions from 3.5, Pathfinder 1e, Call of Cthulhu, or Dungeon Crawl Classics) and the setting would probably be my homebrew mashup one (Middle Earth might have been used straight up if the group went with that one).
I got some questions from the group and everyone got jazzed up about Thundar the Barbarian D&D so it was Iron Gods 5e in my homebrew setting with lots of character specific input to riff off of.