Hello, welcome to the forum!
Official servers are no longer available so you will need to find someone who hosts a private server. To connect to a private server, you need to know the IP address of the server and the port number (usually the port is 55559). In the game, if you go to the multiplayer section where the servers are usually listed, you will find a place on the left side to enter an IP and port. Type the private server info there and you will be able to join.
As far as I know, I am the only one who runs a 24/7 server. You can find the IP in my earlier posts
