What about being able to change our avatars to an existing card. Like what If I wanted to look like the Grey King for my hero? No extra cost in artwork since we already have it, just a little time to change the code so avatars are changeable, much like our pets, kingdoms, armor, appearance are all changeable already. 
The big deal here is the keys tho, which are infinitely more valuable to everyone since they’re the main source of getting cards, and the core of this game is as a CCG (card collecting game + match 3). All players need cards, new, mid, as well as vet players. These tasks are detracting from that, and on top of nerfing keys that are given as a reward for those who are playing more than most, which is a good thing that players are encouraged to play more and able to get more LT’s. Instead we are cutting the supply, and putting it behind 3x the work to get to it. Making epic guild tasks that cost 31.2mil to complete (15.6 x2, based on starting value 5k vs 10k for brown vs epic brown tasks) on top of the 15.6mil for normal guild tasks adds up to 46.8mil / 30 and you get over 1.5mil per player. Most ‘top’ guilds only ask for 500k from their player base, and expecting them to play 3x more is unreasonable and definitely not sustainable. Any guild that is currently doing less than 30 LT’s will never see one again, and those that do 30 will be struggling to get any.
One of my previous ideas was to make guild tasks (GT) more accessable to more players, currently I believe most guilds can only handle doing about 2 guild tasks a week out of 6. With epic tasks (ET) being about twice the price most guilds can only afford to do maybe 1 ET. I don’t see how that is helpful to the community. One of my previous proposals that I made on GoW Community (discord) was the lowering of the GT cost as well as the ET cost.
For example: GT 15.6mil → 10mil, ET 31.2mil → 20mil = 46.8mil → 30mil.
This way you will be asking for the player base to increase work production (playing time) to be double to produce 30mil/week instead of 15mil/week to finsih all the tasks. This is easier to swallow with a bump in 2x the effort rather than 3x which is really an unreasonable ask of us.
The players are not against the idea of Epic Tasks, what they are upset about is the time sink cost, and nobody is going to just play 3x as much, they will just head off to other games to find more fun rather than more grind for less resources. What I mean is we are seeing more time invested for less valuable resources as in less keys since we have a bigger wall to get thru to obtain more keys.
If LT’s are limitless and this is the issue, I rather you just lower the cost of the GT & ET’s so everyone can get them, but increase the cost in LT’s to 2mil each rather than the current 1mil.
The top 1% who are getting 1500 gems from GW B1 rank 1, this is no problem, and maybe this is the source of the infinite resources, that are only afforded to the top B1 and is unrelective of the majority of the player base.
To increase a game’s base players, there has to be a fun and enjoyable game, not a 2nd job, and if you have a good game that is fun, then players will tell freinds by word of mouth and old players would return as well, growing the player base. Squeezing a turnip isn’t the right way to do this.