I know there’s a mod that can get rid of basically everything scary for the dark bramble. There’s possibly one that modifies giants deep too.
Also if you don’t mind a minor spoiler for the content of giants deep:
There isn’t anything that can actually harm you under the water. The only creatures I remember are jellyfish and they don’t really acknowledge you (no leviathans or anything alla Subnautica)
Don’t forget remove content from the PC Version then stop updating it hoping that it gets people to buy it again on the newer consoles.