You can download Walkin VR from the Steam store for free. It’s an accessibility focused program which allows a great deal of customization. You can edit the motion boost of your controllers to make it easier to reach objects depending on your arm length. If you have the XBOX Adaptive controller, you can use it to great effect with this application. Within the Walkin VR application, navigate to move/input emulation and enable it. Combined with the Controller, you should be able to use the bound accessories to play any VR games that require roomscale and enjoy freedom of movement.
Do you have SteamVR Base Stations 1.0 or 2.0?