Brother, are you facing any issues with ZIC A+ 5w-20? Is there any oil consumption or any other issue? What's the engine oil drain interval?
If there are issues with ZIC A+ 5w-20, then I would suggest to go for 5w-30, API SN / SN Plus, ILSAC GF-5, Fully synthetic engine oil. If you want best for bucks, go for Total Quartz 9000 Future Series 5w-30, buy from reputed store (i.e. there is surety that oil is 100% genuine) and change along with oil filter after every 5,000 Kms.
And... If ZIC A+ 5w-20 is working perfectly fine in your ride, it is not causing any erratic behaviour, oil consumption, etc. then I would suggest to continue using ZIC A+ 5w-20, and no need to switch to 5w-30. (The engine is "tuned" or "set" on 5w-20)
I hope, it helps. Thank you.