The trick to getting a tight tire back on the rim when tire levers don’t work in reverse, is to start the bead of the tire inside the rim. Work your way around to get half of the tire or more on the rim. Then, with a tire lever, start pushing the already mounted portion of the tire toward the middle of the rim where there’s a dip and more room (or a smaller circumference.) work a little more tire past the rim and repeat. Some tire / rim combos are very stubborn, but this is your best chance.