Here's my second suggestion for career mode 2.0 (slightly updated)
Some games incorporate a system where random ships can "say" messages. Commuting NPCs will have a funny message sent out once in a while, stations have a more serious message like "s.s. voyage, you are clear to dock." and pirates/thieves can say messages at the start of, during, and near the end of battle. (2025) There are other messages for completing missions, signing on them, leaving and approaching stations and ships, hailing, collision, damage, pretty much anything and everything.
It's a surprisingly subtle detail, but actually helps make the game feel more alive. Here are some screenshot examples from the game "avorion".
Imo this would make the campaign feel a lot more "alive". Lmk what you think!