Depends.. If you wanna have secured credit card you can continue your FD. Else you can close it and transact using debit card , upi and maintaining your savings a/c will get you pre-approved offers
FD card does not guarantee you a pre-approved card. In 2018 i bought ICICI FD card. Till 2021 i didn't receive any pre-approved offer. I had lesser no of txn's in ICICI a/c.
Pre-approved offer depends on how you use your a/c n debit card. Viz. for purchases