Just forget the early objectives if you have no lane priority and can't gank your laners, it's not worth the risk.

Only gank if you're 1000000% certain you'll get kills. If you can't, just powerfarm until you get your 2nd/3rd item powerspike. You will only stop your full clear to gank if enemy has literally 0 hp and NO WAY to escape. Popping a flash is not worth losing your fullclear tempo.

You need to check your map 24/7 like you're a security guard to see if you can grab kills. If there's a chance you can kill steal just do it.

Full clear (watch this tutorial from Karhus: https://www.youtube.com/watch?v=EKztFzXztlA) -> scuttle crab from the side you started your clear (if you can get it, good, if not, no problem) -> full clear, if you didn't get level 6 just steal some minions lol -> full clear... keep this loop and boom you're strong you can kill people and you can grab objectives!

Do NOT leave your jungle camps alive while you mindlessly sit on some random bush, if you can keep farming your jungle camps you'll get tempo advantage and will get really strong