The same way you made the gains, you have to eat and train to maintain what you have gained. Remember, a large portion of gains on cycle are intracellular water and glycogen, that's going to go away a little as the gear doses come down or you go off. When the weight disappears really fast post cycle it's not muscle it's water and glycogen, just like muscle takes a long time to build it takes a long time to disappear too the real muscle is what sticks around after that water and extra fuel storage disappears. But however you're eating and training when the cycle ends is how you should continue to eat and train after the cycle. And definitely don't try to cut right away or you're going to lose it. Spend a few months maintaining that size.