Tata Neu Plus aur Monkeyback cards ko close karwao. Savings account aur FD mein bahut saara paisa rakho (At least ₹5L) for months. Account ko preferably Savings Max mein convert karwao. Wait until you see pre-approved offers from HDFC Bank with a limit of at least ₹1.5L. It may take at least a year or lesser, based on your luck.
When you see such high limit, apply it from the Tata Neu app, not HDFC's portal.
Also, it would be great if you shop often in the Tata Neu app so that Tata Digital can get HDFC Bank an LTF offer for you. (Happened in my case before I got the LTF Tata Neu Infinity credit card)