Once you have the definition, take action every single day towards that goal.
A lack of purpose is probably one of the biggest causes of anxiety, stress and confusion.
You need to know where you’re going. Let me illustrate with a metaphor, say you want to go from Scotland to London, because there’s a really important thing going on there.
You jump in your car and start the journey. As you drive, all of a sudden BLAM! You get a flat tyre. Cursing your luck you get frustrated, but because you’re on a mission to get somewhere you really want and need to be, you find a way to sort this out. Either replace the tyre yourself, or get help.
So then you carry on, before you hit a bucket-load of traffic. There’s been some sort of incident. The traffic jam will easily add 2-3 hours to the journey. You have the option of turning around and going back, BUT it’s important for you to get where you need to go.
There could be a number of further obstacles on this journey, but each time you face a challenge you overcome it, or find a way to get through, because you have a purpose, you have a destination to get to.
On the other hand, if you didn’t have that purpose and you didn’t define the destination, you’d set off on the journey and probably not get past the tyre becoming flat. You more likely to give up, go back, or wander off somewhere else and get lost.
So the same is with life, if you haven’t defined your purpose, if you haven’t defined what you want to do and achieve, you’re going to end up lost.