If you've got Horizons (ie. planetary landings) engineers can massively upgrade your ship
Guide
But to access or unlock them you need to do, for want of a better word "quests".
Professor Palin can upgrade your thrusters to the highest level giving more speed and maneuverability (or efficiency if you choose)
Palin's quest is to get 5000LY from your starting base, which is a fair distance although you've already done a 2000LY trip so you've experienced some of the space madness from long distance travel
Having got G5 (Grade 5 the highest level) upgraded thrusters on my Python I'm now trying to unlock Hera Tani who can upgrade my powerplant and involves a very annoying series of fetch quests.
Engineers - need unlocking via quests and paying by materials .
Anaconda - I'll one of those myself one day, just need the another 900million for outfitting!
Oh and one QOL thing I've found which you may know already, a really big fuel scoop. I've a 6A on my Python now (40million so nearly as much as the ship!) and I almost never have to pause at a star to refuel, just the flyby to align the next jump point is plenty.

For the Palin trip's 500jumps that's a good time saver.