I cant remember much of the story but I recall it has some similarities with Arkadia by Sunseeker.
As I recall the mc (human) either starts with or soon gets one or more planets & has advanced tech.
He comes across a space battle ground near a planet & finds a few survivors on one of the ships (not humans).
At times he travels between earth & his own planet.
Earth forces want to get hold of his tech & perhaps his planet. Earth ends up sending a fleet of spaceships to attack/takeover his planet etc. After he warns them not to approach he proves how advanced his ship/tech is & the Earth fleet retreats.
I know it is not a lot to go on but hopefullyt it triggers a title in someones memory.
Cheers JPS