Sorry for answering just now.

X4 Foundation is the latest game from the X franchise (yeah, coming to it).

It is sometimes called the "Garman Star Citizen" which is of course wrong since the first X game is way older. The series is made by a small German game studio.

Think Sand Box Game in big universe. Mostly you trade and build your own factory stations to get new ships and stations ;)
It is very hard to get into because of all the things you can do and playtime is measured in days (if not weeks) instead of hours as for most games.

https://www.egosoft.com/games/x4/info_en.php
https://store.steampowered.com/app/392160/X4_Foundations/