Problem: internal memory gets full real quick

Hello guys, I love my s4 mini lte, only thing I hate is its small internal memo. I tried moving some google apps to system, still, I don't have enough space to install or even update apps from the playstore, I also use my 64gb sd as internal and moved most apps which support external. Nonetheless, this is my main issue with my phone. How can I get more space on internal please!
I'm on cm 13 rooted.