Getting lean (or leanish) is pretty simple. This doesn't mean it's easy but that it doesn't require any complicated techniques. It simply requires the consistent repetition of some very straightforward basics. Staying lean, however, is where things can get a bit more complicated. This is true whether you are an average Joe or a competitive bodybuilder, a swimmer, a football player, or a surfer like me.
You either need to burn more calories through activity or consume fewer calories. What you need to figure out through trial and error is how lean you have to eat in order to feel full while consuming roughly the number of calories that enable you to maintain your weight. For most of us that means unprocessed foods with a little room for indulgences now and then. These "indulgences" matter. Life is just more enjoyable with them than without them. There are times when all of us will eat to excess. I do this whenever I am with family. Offer me a piece of homemade pecan pie? Gladly!
Now the question becomes, What do I do now? What we often do is more cardio because that's what will burn off the calories the quickest. Another option is to put these extra calories to good use by getting in a few extra sets at the gym. Might as well use all those carbs for some muscle building. Either way, it's essential to remember that one meal or even one day of overeating will not affect your overall progress. What matters is what you do consistently over time.
The best way to reset is not with restrictions but by resuming your normal eating, walking, and lifting habits as soon as possible.