You can get more chips on the system sectors that will come or that you didn't complete it fully.
Also, you can get trophy chips. You get them every time you get a trophy from the debug journal.
If these aren't enough, you can kill either Eliminator or Gold trichloma to get stat chips from them. But the odds of getting are minimal and they are so powerful, that you need to complete the game first before killing them. Also, they appear randomly on system sectors. The chips they drop are really weak, so it's better to do the above options first.