WinSCP does not have an "autoreconnect" option.
But if you use WinSCP with one specific session only/frequently, you can create a desktop shortcut that opens that session.
https://winscp.net/eng/docs/ui_login#shortcuts

Is there an option to automatically reconnect/restore the previous session on startup, without having to click the "Reconnect session" button?

I feel like it should be there somewhere in the settings but cant seem to find it.

The previous FTP program I was using had it, just assumed it would be a standard setting.