Boost speed on Moto G 2015 (8GB)

I got my Moto G mid-October 2015 but I opted for the version with 1GB RAM because of budget constraints. At first it performed pretty well even while doing a bit of multitasking, but now I'm just having problems; excessive lag during the animations and loading apps, slow multitasking, apps closing frequently in the background, battery drain and etc. How do I rectify this? I have tried limiting the number of apps allowed to be on in the background, using Greenify, factory resetting and even installing custom ROMs.

This is kinda putting a damper on things for me. Any help would be appreciated ;3

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