If you think some applications take too much of your RAM storage ot you just have too many junk files, your device may just need a little bit of cleaning and boosting up. In order to do that you should follow these few simple instructions:
At the very beginning go to Google Play Store.
Find Clean Master app, download it and instal it (it's free).
Start the Application.
Then choose the Junk Files icon and click on it
Grant the permission to access your device
After a quick scanning you should be able to see all the junk files this app has found. If you wish to clean it, click on "Clean Junk".
You should see the notification that your device has been cleaned and how much of the Junk Files have been deleted.
We also recommend taking the full advantage of this application - you can use it to boost up your device, cool down the CPU, handle your notifications, monitor battery status to prevent overchargin, and even locate your device in case if losing it or having it stolen. Certainly, this is an app worth checking out!