Hmmm....
Life has meaning when you find a reason for it to have meaning.
Cryptic....isn't it.
Okay. When I got saved, a part of my life began to have reason, but I still lacked direction. I don't doubt there is a "reason" for me to be here, but it still is out of focus. So, I do what I can and choose to be happy in the meantime while waiting to see what happens next.
I hit a mid-life crisis when I turned 30 and was in an accident. I examined my life to see where it was going. I made some changes....took up bodybuilding

....put things where where they belonged based on how much they really meant to me. So, my life has more "meaning" than it used to.
Some Christians would say that life is "a dressing room for eternity." I agree, but if you NEED a secular view, you spend your life exploring physical, emotional, mental, and spiritual areas to find yourself and your place in life....even if it's just digging ditches and going home to your wife and 2.5 kids.
When you've found the place where you are more or less content in all those areas, you've found the "meaning" for your life.