Rocket boost and diamonds
Your rockets have a specific amount of fuel. Make much better use of the fuel by not using all your rocket boost at the same time, however rather, tapping the screen and gradually letting your fuel out. Do this while slanted so that you can go a long range, then use the increases and the momentum to launch yourself a definitely insane range. Grind for coins by not purchasing any of the increases and not using diamonds to restore, however rather just by introducing and playing over and over. Use your profits to acquire much better items. Repeat as often times as you have to in order to.