Such strength in you, so what to say?
Take care of yourself, this is an endurance ride, and yes I would encourage you to ride again. Passing through an extended period of grief in my life l road my bike. A bike, and yes alone now, is a great place to cry, to howl, to pray, to give yourself over to nature, to your body and snag a small moment of balance or self back before you return to the endurance ride/life you and Rowan are passing through now.
It doesn't have to be long, in fact probably it shouldn't be, but do make a date for yourself each week or more as you can, and take time, take a ride, take a healing journey.