There comes a great feature to solve this problem,
You can change your primary storage card from internal to external SD card
In order to this,
Go to "settings"
Select "Default storage location"
Choose External SD card
Note: This feature is special because mostly many apps can't be moved to SD card (like Google products), so by changing default storage location, the result will be APP's main resources will be in internal but rest in external SD card which saves a lot of storage. (I did it).
Some extra tips: Also change default storage location (this option available in few apps) like in camera, google offline maps, youtube offline videos etc. And don't install a junk cleaner app, they are useless cause more harm then helpful.
Hope, this solves your problem.