Subnautica - SCUBA, Unknown Worlds, drowning

I have spent most of my time in the game just exploring and building bases, and not really following the story. I only just went into the Enforcement Platform for instance, even though the event there was weeks ago in game. (My Inventory was full, so I left the island, and never made it back until now.)

I also ignored the 24 hour notice about something or other. Was that telling me I should have gone to the Aurora to fix it? Should I go now? I don’t want spoilers, just a nudge to get me back on track on the story. The last story info I got was to go to the disease facility, but that is far too deep for me to go yet. Should I just concentrate on upgrades so I can go deeper? Go to the Aurora?

Thanks for any advice.