Either more fuel or patience, and I think patience is going to win. There are interplanetary 'highways' where you can spend barely any deltaV to go everywhere,

Either more fuel or patience, and I think patience is going to win. There are interplanetary 'highways' where you can spend barely any deltaV to go everywhere, provided you have patience. Probes are already transiting Earth and Venus multiple time to get slingshots to outer solar system. The ideal space base is a manufacturing hub in the asteroid belt. Where deltaV to go to anywhere else is ~0 and deltaV to launch stuff from base is also ~0. That's the only way to have star wars sized ship. Launching one from gravity well of the Earth or even Moon is just lunacy.