I spend on my main account but for about 6 months I ran a F2P account and this was how I gained 5k coupons every month.

Convoy: 40+40+50: 130 Coupons daily. x30 = 3.900

Login for 1 hour: 10 coupons x30 = 300

Monthly Login: 10+20+30+40+50+100 = 250

Group Summons: 160 coupons x 4 per month = 640

Group Activity Wheel (low balling it) 20 x 30 = 600

Grand Total of 5,690 coupons a month.

I'm playing this game for almost 1 and half years. I'm F2P.

I will tell you what I get as an pure F2P in 30 days - (This data is from December, 2018)

2 SS Convoy + 1 plunder = 130 cp x 30 = 3900 [ This value depends on your bp and if people plunder you or not ]

Tree = 21 cp x 30 = 630

Monthly Sign In = 250

Daily Log In = 10 x 30 = 300

Puzzle = 40 x 4 = 160

Lucky Wheel (Min.) = 500

Myoboku Trail = 60 x 7 = 420

Wishing Lanterns 20 x 7 = 140

Summon capture = 80 x 8 = 640

Miscellaneous ( Treasure of the sage + Lucky board + Survival trail + Others ) = Approx. 200

So, Total = 7140 cp from the above mentioned places in 30 days.

Tell me if I forget to mention some other events, from where we get free cp.

As a new F2P player you can't do 2 SS convoy, because then your new server is not merged. And always take support from high bp people from your group during convoy for safety.

As I mentioned in my post - "I'm playing this game for almost 1 and half years. I'm F2P." Because of my constant play for this long, my bp is higher than most people in my server, so plunder is no problem for me. Maybe after one year of constant play without miss, you can do that as an F2P. But not as a new player.

And as for plunder, you can do that everyday without any problem as I see many people do in my server. But you have to find how to do that yourself. Ask you friends in game about how can you do plunder everyday without any loss.

You get the plunder license if you plunder S ranked and below. You don't get plunder licenses when you plunder someone for their coupons (SS mission).

You can do 2 SS convoy everyday if your server is merged.( But there are some condition I think - I don't know exactly, but you need to be under rank 150 in your server ranking in Ranked battle and under rank 300 in your merge server ranking in ranked battle (Someone confirm pls if I'm right or not on this two condition)).

@ Scarlettblue - I'm getting cave key actually since 1st week of January. That was my data from December 2018.(4 key is always better than 21 cp , I realized that in January, )