Why can't you just unilaterally decide that your life is meaningful?
That provocation comes from Pamela J. Hobart, a "life coach for smart people" who is a qualified philosopher and nothing else. She reminds me of Sherlock Holmes. Like most ordinary people, she is a virtue ethicist.
She also offers this:
if you've been trying something weird, maybe it's time to try something more ordinary.
Much more of value at the link.