If you have booked a travel cancellation insurance and the reason for the cancellation is covered by the insurance, cancellation and cash return is no problem.
You can´t add the insurance afterward with an additional order. Make sure to book the insurance right away, if you want it.
Please note: Some travel cancellation insurances include protection in case of avoidance of a sale. Please ask your insurance for more information.
If you would like to give away your ticket to others you should use the resale platform, because abuse is not possible.
Be also aware of not publishing any photos of your tickets with visible barcodes.