To ensure the ultimate immortal society never becomes complacent, give them very difficult multi-generational long term goals to work towards. that influences what people want to be when they grow up.
Not just to sustain but improve Society.
Space elevators, space tether space hook.
Purfect Education, Lifelong learning and Individual growth.
Perfect communication, not just one that “works”, communicates emotions and Information using inscriptions, sounds, body gestures, telepathy, in the most effective way. maybe Synesthesianese?
Gravity manipulation, like zero gravity technically. a true Tractor beam.
Matter Synthesizer 3D deconstructor and 3D printer, matter deconstructor to get the fundamental components to 3D print anything and everything: inorganic, organic, food, Replacement of body parts, organs, bones, intricate cybernetic augmentation, utilizing precision gravity manipulation technology. 3D printed Skin healing beam.
A way to keep people in top physical condition in any environment, especially preventing muscle atrophy in low gravity.
Cryo sleeps for space travel.
Chemical preservation or just organic preservatives like some kind of GMO fungus?
Remove all the harmful genetic disorders.
find Immortality of some kind,
VR full dive nerve gear, simulation.
Perfect AI Artificial Intelligence.
Improve Renewable energy sources.
Use only Renewable energy.
Better Superconductors, more efficient Energy storage and transportation.
Dyson sphere or Dyson swarm to harness all the energy from the star.
Fusion reaction electric generator for more efficient energy for space travel. running on Hydrogen and oxygen, the fuel that could be harvested in space.
F.T.L. Faster Than Light travel.
Genetically engineered perfect life form and perfect humanoid life form, or something else.
Very powerful weapons, death star,
nanomachines, autonomes, battle robots, but be careful.
prove or disprove God, or spirituality and consciousness like the existence of a soul.
Set new goals as we learn new unknowns, To infinity and beyond!