Getting back all your AP only for you to spend it again on the same things is a waste of a reset.
So unless you have a lot of excess AP invested in the earlier phases, I don't think the AP reset is useful for you right now.
If last year's Mothers day sale is anything to go by, the button probably still shows that it costs 150 coins to reset AP, but once you click it, you will get the following message:

For people that find this forum later, and do wish to purchase this package:
https://www.warzone.com/Purchase?ID=40 You can buy multiple if you wanted too.