Well, if it's LTF, there's definitely value in holding Flipkart axis. If not, then you shall make a decision.
I'd say why it is worth it, you get offers 10% CB offers on Grabdeals, which is on top of 5% CB of the card. 15% is pretty great value if you ask me. Ace can fetch you till 12%. You should at least hold the card till renewal fees is charged, I mean close it just before that.