I don't know exact limit. But for my LTF application I had 7.5 lakh limit on another card. I think you should try if you have limit of minimum 5 lakh limit on another card. First they offer a paid card, you should resist and try for a LTF card. They will offer LTF card after 2-3 months.
Consider to apply Yes Bank First Exclusive or Indusind Pinnacle or Legend CC from bankbazaar or paisabazaar (If they are giving you LTF). I have both in LTF form. They have no use other than Priority Pass (without any spend criteria). Both have limit of 5 lakh.
Do not close Flipkart LTF card or any LTF. It may be useful in a future flipkart purchase where cashback has no limit. Such purchase may be electronics, appliances or furniture.
If you are not doing flight/hotel booking, HDFC Regalia has lower returns than Millenia.
Don't go for fuel card. You...