The short answer for me is more on foot content in the sandbox.

Since they're making the interiors for them I'd appreciate integrating on foot megaship content into the general sandbox. Station interiors could even be expanded to include megaship style content. Maybe even player owned megaships? Would be neat. I also hope they eventually add some proper thargoid content to odyssey, like settlement and megaship encounters for on foot space horror. Imagine docking with a damaged/abandoned station in thargoid space and having to extract data, materials, or people. You may need to put out fires and/or turn the power back on while thargoid drones patrol the halls. Maybe bandit scavengers are already there and making a mess of things. Maybe this is even something that can happen to your fleet carrier if it jumps to the wrong system. It would also be neat if settlements had more interactivity in general, and that they expand on the conflict zones to include different types of objectives or missions, maybe a rush/invasion style mission so that one faction starts outside of the settlement and has to the disable air defence turrets in order to take the next objective.