To answer your questions
1) Yes there are better cards, it depends on the amount you can keep lined. In HDFC you can approach for Millennia (FD amt 1.25-1.5) or Regalia Gold ( FD amount 3+ smthn). Now both of 'em might be chargeable. IDFC WOW is cheap that way (min FD 20k), but otherthan it's reward rates it has better use case scenario with BMS BOGO, RSA and 0 forex, which you get for no LTF cheap cards.
Now another cheap, useful and rewarding FD backed card is Supercard from Supermoney app. The FD is backed by Utkarsh SFB, so you can consider it safe for less than 5L of FD.
Also there are newer SFBs partnering with many apps like Stable Money app, Unity Finance bank, etc. If interested, search for em in this forum
2) Some Apps like Paytm, Phonepe charges, Some does not like Amazon or even myjio/airtel app per se.
Now to maximise your bill, as
@Beyond suggested, wait till April 1, as there is a likely that Rupay Platinum offers are gonna find its grave. If it does not open Jio Bank account and prefer for virtual RPDC, also open BOB 2k MAB account for free physical RPDC. With that pay your bills via Amazon on Fridays for 100 discount on any bill other that Creditcard and fastag bills, over 500.
Now if the RIP board is put for sure on RPDC Amazon offer, then there are little ways to maximise your bills.
1) Use your IDFC wow for few days, build a good enough credit scores apply for Apay ICICI CC via Amazon and use it for bill payments at 2% CB.
2) IDFC wow will only give you 0.66% value back, with a redemption charge of 99+GST. So ideally no reward as such.
3) Consider getting Axis ACE credit card, again once you have a good credit score, for 5% disc on Gpay (however convenience charge is the pain in a**).
4) If you can go to higher lien amount and get Millennia CC, then use it to buy Apay vouchers for 5% CB (But may not be LTF)
5) Get an HDFC account and opt for Millennia DC for 2.5% CB on bill pays.
6) Download Supermoney app and get FD backed Supercard, if you don't want the offers offered by IDFC. It has better reward Rates on UPI payments and bill payments via UPI, also extra benefit on Myntra, and Flipkart.
Hope I answered your doubts.
If it did, may mark this as solution.