Some people might shy away from answering this question for fear of coming off as pretentious but the way that I see it is that we all implicitly act out our belief about the meaning of life through our words and actions (or silence and inaction). So you might as well get clear on your own belief. The trippy thing is that some people probably live an entire life without getting clear on this question. For me it's joie de vivre [1]. Joy is my north star in a very primal sense of that phrase (imagine you're navigating a terrain you've never been through and you're relying on the star to keep you in the general correct direction... you never know what's ahead but you can always know whether you're heading towards the star or away or you've lost it entirely). I don't have a clear singular purpose in my life. But it's easy for me to tell when I'm doing something that brings me closer to or further from joy. Right now I'm sitting in Golden Gate Park, sipping a coffee, reading a book about the history/ecology/etc. of Joshua Tree. I'm at peace right now because that star is directly ahead of me. I'll leave it at that and also mention that I wax philosophical a bit in my "sabbatical prologue" post [2].
[1] https://en.m.wikipedia.org/wiki/Joie_de_vivre
[2] https://kayce.basqu.es/sabbatical/prologue