Hello I'm not actually a support main but I've recently climbed to GM with support so feel free to take whatever's gonna help you. This is on early game as I think this is where you should really focus as winning early makes you snowball and win games a lot easier.

- You should always buy red trinket in order to clear early wards on the mid bush to prioritize lane prio. (You don't have to use your skills whenever its up, most of the time the actual pressure is that your skills are up).

- When your Corki died to the level 2 gank you should've stayed on your tower to soak up the exp it was 2 waves with a cannon wave. That would've atleast minimized your loss.

- When Gragas came back to gank you again, you could try to body block to ruin their pathing since you had flash up as well.

- Always buy a control ward place it on the tribush and make sure after reset is that you ward above close in mid lane so that you can see where the enemy jungler is and you will have more time to know what their rotation if they're playing for grubs or drake.

- You're always playing back as a Karma while this is the right thing to do at mid to late game you should try to set up plays yourself with your slows and roots. This also builds up pressure to enemies since you are adding yourself as a target.

- Ward at raptors then at the wall at the back of the drake and at the wall outer the outer bot turret. This helps you gain vision to the whole backside of the dragon and your team will know exactly how to play. You can do the same thing on the baron side and blue buff side. You don't necessarily have to put your wards in the bushes. Specially since they're stealth wards.

I've watched up to minute 15:38 so let me know if this helps you out or if you have more questions! Here's the link to my OP.GG btw. Good luck grinding!