My advice would be always keep learning, ignore everything others tell you, follow news and trends, participate in meetups and conferences, be an active community member, contribute to open-source, never stop and master the search:
P.S. full-stack is not someone using JS on backend and frontend or someone who have written Hello World or basic apps in different languages. First master one language, one technology, one field. Learn to find a focus and to be a realist, evaluating own energy, knowledge, possibilities and time.