Start by Not Doing the Wrong Thing
Sometimes it's difficult to do know if we're doing the "right thing" or not. We might question whether something is our "calling" or if we were meant for something else. We might be jealous of someone else's career or lifestyle. We might struggle with FOMO (Fear of Missing Out) and feel like if we're not doing everything we're missing out on "that one thing."
Though this is a constant struggle for a lot of us, here's a little tip to get you moving in the right direction. It's not a definitive answer, but it'll at least get you part of the way. It comes in the form of a quote from Frederick Matthias Alexander, the man behind the Alexander Technique.
That's it. Just stop doing the wrong things. While the "right thing" can often be an illusive utopian dream, the wrong thing is almost always clear. We have this gut feeling about the wrong thing. Our intuition can at least tell us that much. When we wake up dreading something morning after morning, it's a fair bet that it's a wrong thing. If you can move yourself out of the realm of the wrong things, you'll at least be playing with a lot of "pretty close things" as you continue to refine your direction.
Don't get hung up on finding "that one thing" because sometimes that one thing doesn't exist. Sometimes you're meant to do a lot of different things over your 70+ years on this earth. Take it one day at a time. Ask yourself, "What are you happy to be doing, today?" Then do that well. When you ask yourself that question and struggle to answer, maybe it's time to rethink. While the "right thing" is a complicated journey full of u-turns, detours and spontaneity, the wrong thing is the trail marked by black signs with a skull and crossbones on them. Start by not taking those routes. Then explore.