What could Dexter have done in his life, especially other than his love of science and technology and the ability to invent or create such things in his laboratory?

And to be full and clear, what could Dexter have done in order to become truly whole and good as a person, to overcome his fears and limitations, to defeat his rival Mandark and especially the forces of evil, to fully attain the good, innocence, happiness, and especially the love that was all but denied him by his sister Dee Dee, his parents, his babysitter, and just about everyone else around him, and especially, to avoid a lonely death?