There's really no best way honestly, unless you recharge.

The best thing to remember is to stack and save, not spend offen if you're F2P.

Non-merge server: 1 coupon convoy and 1 plunder per day for 90 cpns

Merge server: 2 coupon convoy and 1 plunder per day for 140 cpns.

Stay online 1 hr per day for 10 cpns.

Wishing tree gives some cpns, usually between 13-23 per day.

Mt Myoboku trial, usually comes around once per month for 120 cpns per day during that week.

Group lucky wheel has chance for some cpns, usually 10-20 per day.

Summon capture can be done 2 times, twice per week, for a total of 160 cpns per week.

Some weekend events gives a little bit of cpns.

So all together, without spending u can get a little over 5k per month, little bit more on a merged server with double free convoy.

Zenith is also a place for extra cpns if u make it far.

There's also a calulator online for this game, where u put in what u can do each month and how much wanna save to, and it gives u a good estimate on how long it'll take u.

Hope this helps :)

Hello.

Not sure if im allowed to link outside sources here, so i wont. But if you google Naruto Online coupon calculator, it should be the top one :)