Most likely leaving the reservation as it is will not even be an option because the ticket issuer should and will contact you regarding the need for rebooking. This reservation will be flagged in the TK systems as a reservation that needs attention/to be resolved and TK will chase the ticket issuer to solve it with you,

I believe the prospects of TK and the ticket issuer rebooking you on the next IST-AMS flight despite no award seats available, are better if you let the ticket issuer contact you rather than you contacting the ticket issuer and requesting an invol. rebooking. Hence, you should wait for the ticket issuer to contact you.