ThxUse real money
If you're not willing to spend, then just be patient and keep growing your game. Nothing is instant in this game.
Also might help with earning gold coins: start your space launch program, join an alliance that aims for 50% bonus (extra income from flights for 50% for the whole week), have coins producing buildings that are effective for your own gameplay.
Also don't buy land expansions with greenies until you cannot spend coins anymore. They get expensive quick and you'll need the greenies later on. Unless you want to spend a little then can be a little speed up for you.Yep, in fact, more coins is only comparable to what you buy and as your city grows. I remember when I needed to 'save' 8000 for my coal power station. Now I have ~340k coins saving for my 540k town hall! This is not a quick win game. Take your time. If you want to fast track, buy greenies on offer at 3x every other week, then land expansion at 50% off on the alternate week.