Benefits on plus when I use a proxy

So, I currently pay the same amount as the plus subscription to use glm.5.1 direct from them. I love it and it works great, and I don’t need a new proxy service.

So, if I am totally happy with my current set up, sell me on the plus service. Can I get glm5.1 with my own custom advance prompt? What other cool features do I get for my money. What are the benefits of plus. Sorry if this question has been asked a lot I have been off both Reddit and janitor for a while! Thanks