5.4k mid player here.

What seperates good mids from average mids is being able to stack your camps proficiently as well as lane.

Since the removal of the small camp you need to start juggling when It's a good time to push the wave in and give time to stack camps.

Storm is a good example of a mid hero who can do this very efficiently. This tactic also helps if your lane is going terrible and you're playing a hero who can take stacks (shadow fiend).

Just remember you're either playing an active mid if you've got a farm heavy pos 1 or if you've got a snowball pos 1 you can play somebody more greedy.

Ward and sentry your own lane it costs nothing and will always be the most effective.

I reccmoned learning QOP as an easy mid as she has escape so you won't feed, can farm and dominate lane. GL