You can transfer your Citi Thank You rewards points to participating travel loyalty programs. One transferee is Accor Live Limitless. Citi Thank You rewards transfer to at a rate of 1000:500, so 1,000 Thank You points would yield 500 Accor Points.
There is currently a limited time offer through May 11, 2024, where you can transfer ThankYou points to Accor and receive a 50% bonus. So now you will get 750 Accor Points when you transfer in 1,000 Thank You points.