I will show you two methods on how to stop insufficient storage, the first guide requires no-rooting while the second guide requires rooting.

How To Stop Insufficient Storage Space without Rooting

Open the Settings app, tap Apps, in some device it’s Applications, or Applications Manager option.

Scroll sideways to the ALL section. You'll see a list of all apps and how much storage space they're taking.

Tap the Menu or More button and choose Sort By Size to arrange the apps by which take the most space.

Tap an app to see how much storage space it is taking, both for the app and its data (the Storage section) and for its cache (the Cache section).

Tap Clear Cache to remove its cache and free up that space. You could also tap Clear data, but that removes your files, which is most likely a bad idea.

Repeat this step above for each app to free more space.


In some devices, there's a faster way to clear all the apps' cache automatically:

Open the Settings app, tap Storage (it should be in the System tab or section). You'll see how much storage is used, with details for cached data broken out.

Tap Cached Data. In the confirmation form that appears, tap Delete to free up that cache for working space, or tap Cancel to leave the cache alone.


How To Stop Insufficient Storage Space on Rooted device

Requirements:
Rooting
Lucky Patcher

Note: This step requires rooting, if you don’t understand Rooting check What is Rooting, incase you want to root your Android device there are many apps that can do that, but the most guaranteed is KINGROOT while rooting with kingroot you will need to turn-on mobile data to carry out the rooting process successfully and within some minutes your android device will be successfully rooted.

Download latest Kingroot v4.9

That said, now after rooting you will need to download lucky Patcher, with this app you can move both in-built apps and custom app to external memory.

Download latest lucky Patcher v6.2

Follow this guide to free internal storage space

Install and open lucky Patcher > Navigate on any app you want to move to SD card > Tap it > Click “Move to /sdcard” > Click “yes”


wait for some moment “depend on the size of the app” > then a success message will pop up


Repeat this step for each app to free more space.

Watch the video below for easy understanding:


You can also watch the video in this link
https://www.youtube.com/watch?v=FR79FCHW6t4

http://www.damtops.com/2016/08/how-to-stop-android-insufficient.html