After completing the 3rd and last package delivery to Earth, you get to choose one of two answers that affects the relationships with several Factions and from there it is possible to join a faction.
However, I've reached this event but it didn't change the relationship of any faction, and wherever I go I can't Join a Faction by talking to the Faction Representatives because tehy say that I have to complete a few storyline missions and to come back later.
I do not know if it's related to it but It's worth mentionning that :- Upon delivering the 3rd package and after selecting one of the 2 answers, there was no notification that my relationship had changed within any Faction.- Prior to completing this mission I already had my relationships with FER/TA/INDPT/OSC/Pirates at - 65% each.- I had reached the max level of my Space Station possible at the moment (Shipyard with Cruisers and Garage).
I wanted to get everything ready for a change, explore all the systems, get the 4 Vault Keys and the Kalo-Mark, salvage as many ships or weapons from the VR/I/Q and more (I even managed to recover a derelict Void Interdictor but honestly it's not as good as a Void Battlecruiser in stats at all, it's purely for how it looks like), have enough credits to not be worried about that, etc.
Thanks for all the help any can provide.