I know you are busy but thought i would drop my suggestions here so they don't get lost in the comments. These are mostly new buildings and modules.
1. Add a building that will spawn a hyper relay - Starbase strong does this
2. Add a building that will spawn a gateway (prefer it in star orbit) - Also in starbase strong
3. Re-balance the modules and buildings that produce resources to be more in line with vanilla and also allow production bonus's from research. ie hydroponic bays will be modules and when you research "food processing" you get a food processing bldg that will add +2 production to each module- Starbase buildings and modules does this pretty well https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=1834615504&searchtext=modules