Just double a resource for a weekend or something here and there.
I play other games that do this on holidays n just mondays or whatever and it like x2 the amount of people playing with something so simple.
Double gold from all sources for 3 days, double gems from all sources for 1 day, even just hero exp it doesnt matter you could rotate the doubled resource.
I know id play more if there was double gems or vault keys or something.
Is it hard to do? Seems so easy. People will feel like they have to play during that time period.
Do it. And thank me later.
I feel like its been done b4 n some sort of way. We get x2 class exp for events so it seems like the mechanic is somewhat there already. All your problems are fixed you are welcome