Help me get coins

How would you help exactly? Once a chest is opened it can't be opened again. You should try the other game modes if turf takeover is wearing off on you. Going into other players home worlds just to have them open chests isn't a very quick strategy anyways and you could spend millions of coins and not get the legendary you want

One of my friends have the game and the ones that do won't help me ☹️ anyway I have nearly all zombopolis items so getting legenedarys will be easier and easier

Completing the chamber of gnomes gives you a whopping 1 million coin reward. 

If turf takeover is boring for you temporarily, I found it exciting to search for golden gnomes or snow globes for a while. 

Both collectibles reward you with coins, so your effort would be put to good cause.

There's no sharing of coins or chests in this game, so you'll either have to work for the coins or simply purchase them. 

I have fund all gnomes and secrets also a youtuber said they got their coins when there friend opened the GNOME chests while he's in their battlground

I would help out by doing anything they want me to do

Also is it best to save up or spend when you can afford a pack?