I don’t even know where my old account is. I made the mistake of linking my 2nd account with the same email and lost it.
The 2nd and 3rd time, I made it a lot easier. Instead of wasting coins on upgrading tanks, shockwaves, and tech units, I only upgraded riflemen, missilemen, rhinos, pit bulls, and orcas free. The people you end up playing try to go for tech so you win the first pad every time. Then when you reach Gold league, Almost every match afterwards is a challenge battle. Because it’s a challenge battle you never lose progress so you make it up the leagues quickly.
Try it. You’ll see what I’m talking about.