Many great comments so far.
If you feel you need more purpose in life, you don't have to look far. Foster some children who need an adult to look after them, or better yet, adopt a child. What greater purpose could there be then making a difference in the life of one single child. Someone has to do it, why not us?
I was shocked at how many children are waiting to be adopted in my state. Yes many come with issues, but there are also many smaller children. You can specify what age or sex you are willing to foster. We fostered twins at 4 months, then adopted them at 4 years. There is no time for depression or wondering what greater purpose we have in life. We are living it every day and it feels great to make a life altering difference in young persons lives who would otherwise be tossed aside, neglected or abused.
From a Christian perspective, Jesus told his followers to look after widows and orphans. I am a follower of Jesus even though I never set foot in a church or Kingdom Hall.
Best to you in your quest.