I've just found out about this wow

Hello everyone. I am trying to become more consistent playing higher difficulties but my horde control is bad I feel like.

When I watch these true solo players they always seem to know the appropriate times to dodge, push and attack. It is hard to handle when there are a million enemies swinging stuff at me. I get damaged when I want to attack and I don't know how to keep track of too many enemies in front of me to dodge effectively etc. How do you guys handle this situation? If you have general suggestions or a guide you can recommend which helped you, I would be very grateful.

Thanks in advance, have a great day!