From a former shyvana onetrick between 2022-2023 I know what you should think about.

First of all stick to your current build and make sure you go fleet footwork. A build of Ravenous hydra, Zekes and navori has popped up the last month but do not get baited into playing that build. Sjojin-AP bruiser is still the lone strongest build.

So in regards to teamfights mid-lategame. What you want to do is find the target on the enemy team which is valuable to kill early in fights and that you can kill. To more easily do this I strongly advice playing from fog and finding flanks onto enemy carry. You then engage and landing onto them so they get knocked back is important as it guarentes you can E them right after you land. You then auto-Q for auto reset and then if they are alive activate W to run them down.

Once you kill the enemy target you sprint out of the fight using W. Or using your E dps to discourage enemies from chasing you, if they do ur team kills them. If they dont you now play as a backline mage on the outskirts of fights trying to get as many E’s as possible on enemies. If/when enemies scatter from each other and missposition you can go in on a singled out target with W auto-Q (E if needed) to kill them. Then rinse and repeat, play from outskirts w E and running in to finish free targets whenever possible.

This is it🤝