The above is a good starting point.

To fully answer, depends on your plans ( later ) and the number of points you have, and where you are based.

The two "easiest" ways is to eat and get the points credited ( do you have family near an Accor Hotel that does this - check as some do not ) they could use your card. I do not see this as "cheating" as no one will get any status benefits at a restaurant, and they do not have to show ID.

The best way is to do a survey, but depending on where you are, you will need a VPN or the survey will not work. However points posting is slow.

Contact Accor and plead your case.

Transfer points to another program, such as Avios ( better than letting them expire - conversion rate is poor )

Good luck.