It should rarely even get that high. As others have said, finish all of your downloads/transfers and see where it ends up. Then do the reset trick that someone else mentioned.

Most importantly, save all of your PS4 games to an external drive, preferably an SSD. Save the internal SSD for PS5 games. This will cut back on the "Other" storage big time and just free up your internal storage use overall. This will likely save you the expense of buying the extended internal storage, also.