reconnect bluetooth mouse that is already paired without usb mouse

As the title says, I have the bluetooth magic mouse. It is paired but sometimes loses connection. The batteries are charged and I have the Apple bluetooth keyboard. Turned the mouse off and on but it will not connect to my iMac. Also, I do not have a usb mouse. Is there a keyboard shortcut that can be created to open the bluetooth connection in the task bar then choose the bluetooth mouse and connect it?

My workaround is to connect my Wacom tablet via usb then use its mouse abilities but don't want to have to do this.