What to do now?

Hello again! I know this game is supposed to be about exploration and learning as playing but I'm kinda stumped.

I visited the Aurora, finally (maybe a bit early), I've got seamoth and found the prawn suit schemes, and found myself full to the brim.

I don't know where to go as of now. My pockets are full and so are the two floating thingies I crafted earlier, I literally have not spot for anything and don't really know what to do and where I can put everything I need /want, since I don't even know how to install inventory on seamorh . Doesn't seem I have unlocked new particular schemes for building stuff and structures so again, I don't know what I am supposed to do now or to look for.

Please help a peep out, thx!