Help With Getting an S

I mainly play top and have been branching out but Mundo has been a huge love of mine since the beginning and having rekindled my spam with him recently; I've been really looking for my mastery 7 with him. I've kinda of lost track of any clear cut way to get there and most of my games are becoming more focused as I'm cleaning things up.

I'm figuring it's my cs, vision, and deaths but towards vision the only thing I can think of is spamming control wards like friends are saying to do, and I'm taking to monitoring my cs and trying to stay in the top few of each game. Dunno if there's maybe anyone with specific knowledge for Mundo since it's champ specific or at least can take a look with wiser eyes than my own!

Thank you in advance!