in my moto e2 xt1521 internal data got filled up

in my moto e2 xt1521 internal data got filled up. i have only 1.9 gb of data but almost 4.2gb is filled how to fix it,i also tried reseting the phone two times from recovery mode but it was not solved, its all happened after marshmallow update 6.0, my phone is a 4g variant model can anyone pls tell me how to solve it ??and i think this problem arised after making my samsung sd card class 10 as internal and make it portable after some time ,i dont know wat to do i cant install many apps ,pls help to solve it:o (sorry for the bad english

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