Is it worth setting up my own VPN server and what are the possible use cases?

I think we have to be clear in what we’re referring to. Are you referring to the server’s connection to the ISP? If so, then yea, it’s either I trust the ISP or I trust Mullvad. Here’s the confusing part, how does Mullvad protect the connection going from its servers to the internet? Let’s say I want to go down the road of setting up my server, how do I better secure the connection between the server and the ISP. I think we’re in agreement that the client-server connection is secured through AmnesiaWG. However, what I waito know is if someone wants to monitor the client-server connection, what will they see and are they able to pinpoint where the server is even if the connection is encrypted?