Katie Holmes is ready to get back out there! After living a very private life alongside her daughter, Suri Cruise, the actress, 45, will likely start focusing more on herself when her offspring starts college at Carnegie Mellon University in the fall. “Motherhood was always her main priority,” the insider spilled of the Alone Together star, who had her daughter with ex-husband Tom Cruise in 2006. The single brunette beauty may even try to start a romance, they shared, noting, “a dating app isn’t out of the question. She’ll see what the next year brings.” “Katie’s friends say she seems ready to…