I like to watch JGOD and Bennycentral videos for current meta tips
Bennycentral also has a few videos full of tips and tricks to get better.
My advice would be switch your load out first. Both of these guys recommend the amax as your primary and I think the cold war ak47 as an smg setup, though I've been using the ak74u and love it. Are your weapons maxed so that you can build them how you want?