You can start the server as a user session service if you have a service manager for that, like systemd, instead of needing to do it manually. For systemd speci

You can start the server as a user session service if you have a service manager for that, like systemd, instead of needing to do it manually. For systemd specifically, tmux also supports socket activation for the server since some time ago, so you can do that to start it on-demand.