Xihe is a Federation high tech. You're flying out of Zhen Dock, right?
Do they have a refinery or extraction sideline? Trading with a station is a good way to raise rep. The value of the goods you sell is more important than the value of the goods you buy. High tech systems like metals, particularly precious ones, and superconductors. Find a nearby station that sells them and export something like consumer technology back from Xihe. If Xihe has an extraction economy too, you can export the ores to a nearby refinery economy. If Xihe has a refinery sideline, you can bring them ores and export mineral extractors or resonating separators back.
When you get bored, you can run 8t of Xihe Biomorphic Companions and make probably 120k on them if you travel far enough. Foodstuffs are also in high demand, so you could pop over to Ra, which is nearby (iirc - it's been a while once I've worked in that part of space) to pick them up.
Take missions for the majority Federation faction. ALWAYS complete them - abandoning missions has a very negative effect on your standing with the faction commissioning them that is disproportionate to the positive effect completing them has. Don't take missions you're not sure you can complete.
Be very circumspect about who else you work for - very often, the negative effects on other factions of a completed mission isn't clear until you turn the mission in. That's a great way to kill all the hard work you've done in one stroke.
And be patient - rep with a Federation faction propagates up. If you get to allied status with a Fed faction in Xihe, you should move up to friendly status with all other Fed factions across populated space, which has many benefits, such as not having to ever worry about half the blips on your radar.