As shen, Keep poking Shen with your abilities while he is farming, but make sure that you don't get CC'd by him while doing so.

Try to keep your resource bar more than half filled as much as possible. It will help you when dealing with unprecedented all-ins.

If Shen ults to some other lane to help his allies, you should just focus on pushing and taking as many plates as possible from his tower.

Keep the wave close to your tower. The enemy has no sort of sieging potential and can be easily exposed to ganks. As shen, Try to keep your resource bar more than half filled as much as possible. This will help you when you're dealing with unprecedented all-in. If Shen ult to another way to help his allies, you should just focus on pushing and taking as many plates as possible from his turn. Keep the wave near your turn. The enemy does not have some kind of sifting potential and can easily be exposed to the ganks.