It's so easy to become complacent. You start making gains and accept them as the best you can do. But, as you progress, your best is always just out of reach. Your potential excellence increases with every rep.
How is your push-up form? Can it be better? Are you thinking about your chest as you rise from the decline? Are you triceps burning after skullcrushers? Are you getting the most from every circuit?
These are tough questions, and you'll want to say "yes" even if it's not 100-percent true. Set tiny goals to answer these questions honestly. Then set more, more, and more. The more questions you ask of yourself, the more answers you'll find.