Hi Brittney, welcome to the forums,
I’m glad to hear you enjoy Stranded Deep so much and I’m sorry this issue is affecting your save. As Phoenix20 mentioned there is another bigger thread on this which has become one of the main hubs for players discussing this issue. This can be found here: [PS4][2071][Gameplay] Can't interact with most things but I also created a Known Issues post for the forums here: [Known Issue][PS4/XB1] Loss of interactions - this is also for collecting player experiences but also if any workarounds are discovered, I’ll be editing the post to include them.
Please let me know if you’ve noticed if this issue occurs in a cycle for you, if you stay in the game to the interactions come back and then leave again?
Please also let me know if you recall anything you did around the time (or shortly before) the issue triggered such as sailing, harvesting plants etc, and do you recall hearing any noises that seemed out of place?