I got upgraded from Regalia First (LTF) to Regalia Gold (FYF) earlier this year (March'24), have spent close to 2 lakhs as of June
I emailed bank if there is a chance for Infinia, which obviously they declined and on the same email I requested if they could "atleast" convert my card to LTF and my wish was granted
Now the card is LTF.
Since the card is LTF , I have spent another 4 lakhs (not great rewards in comparison to Diners Club black (PVC or Metal) or Infinia)
These are necessary spends and nothing forced, I am aiming to see an offer for Diners club Black upgrade in few months