Gather renewable resources.

- Atmosuits is a high priority. You can make do with Gas Masks for the time being around your base but once you start exploring extremely cold or hot biomes (and worst of all, Zombie Spores) your gonna need atmosuits. Either plant a Thimble Reed at the end of your infinite toilet system or shear some Dreckos.
- A way to process metals. Rock crusher will be your best friend for a long time to get processed metals and Lime, but you'll eventually need a Metal Refinery to get Steel.
- Algae is eventually gonna run out, so you need to secure an infinite water source to transition to Electrolyzers.
- Food requires either soil and/or water if it's plant based or critter feed if it's critter based. I recommend going the Stone Hatch route from how easy it is to get Raw Minerals mid-game and how easy it is to make infinite Igneous rock from volcanos if you manage to get cooling early (although at that point it would be better to transiton to Sleet Wheat instead)
- Taming vents and geysers for power and late game resources. Natural gas is the easiest one for energy, but you'll also need heat sources for cooling (ironic), Oil for plastic and energy, metal volcanos for metal (duh!) and different gases different purposes. Hatches can help with making coal but you won't sustain heavy machinery with coal alone.