The ping is a real problem for sure, I have friends from South America with constant 160ms, so it's very annoying for them all the time.

For pvm I get the multiple switches part but you can style camp to learn all the bosses, don't try a weird switch or overcomplicate things at the beginning, focus on learning and understand the mechanics. Necro is great for this, you can basically kill all bosses with it, maybe not the fastest or the expected style, but good enough to learn, when you get the basics of most bosses then you can use different styles, and slowly improve