Ok everyone I literally just fixed the issue about 5 minutes ago so here it is.
Settings>Apps>3 dots in the corner>Show system apps>Search Keyboard>Clear data for Samsung keyboard.
After clearing the data, when you go try to use stickers or GIFs again, it will direct you to the Galaxy store where you install a certain app. After installing the app, your keyboard will have all the stickers and GIFs like it used to.
I hope this helps.