Got every engineer that I could to grade 5 (no love for the 2 that requires 50 data, plus Lori Jameson for that I don't have the combat rank), bought some ships that I may want to fly someday and modded the essentials for them (FSD, DDT, shield, armour, a few weapons and SBs).
After that, I played a few sessions with the Naphtha megaship in my DBX (never did it before), moved around 5 new ships to Jameson, transfered also my Python there and prepared it for the great material hunt of 3.0.
Now I'm waiting and planning the next moves for 3.0 launch. First I will go to the Naphtha class trader and collect everything until I'm full of most of the mats I can find there (class 3A collector and probably around 190 limpets). Find a nearby material trader and balance the mats, maybe do another round of Naphtha afterwards (or Dav's Hope, who knows - never did this also before). Next, it's either some barnacles shooting or a famine system with a wake scanner. Maybe even some SRV prospecting on 1-2 planets and some high grade emissions search (all categories). Next some RES sites / combat zones in my Corvette with limpets. I may end up mining without a refinery, for mats only, to fill the 300 limit for the grade 1 mats, exchange them to grade 2-3, repeat a few times.
Only after I will be full of mats of all grades, I will went to the long road of modifying all of my ships to max grade 5 + effects. At that point, I may look for a couple of systems for missions, any kind of quick ones to become allied and use them also for mats gathering. After all, I got all my CIFs and MEFs and Exquisite FCs only through missions, doing most of the gold rushes that were in fashion at the time.
I'm sitting on 4 billions in cash and have most of the essential ships in the game, so at least money won't be a problem. I want to do some experimental builds and play with them, but it's a long way until then, especially since my time dedicated to the game is limited.