I know that the process of defragmenting the SD Card you say is no longer working on Samsung phones, but if you want to try it, if your phone is rooted, you can do it with ADB if you can do it with the Root Essesintals application. If you do not want to do this, you can use Google and Samsung applications etc. that you are not using in the phone settings. you can disable things and clear your phone by clearing the cache. If you are downloading different application packages or any files from browsers, don't forget to delete unnecessary files in your downloads folder and you can move the applications you do not want to delete or disable to your SD Card.