How do you make your life fulfilling, and complete meaningful tasks?

Michael Stegar outlines this well with three features

• Coherence - you understand the narrative
• Purpose - it is directed towards a goal you believe in
• Significance - it is important to you or something you believe in

This could be summed up in my own words as

A meaningful task is orientated towards a goal that I understand and if accomplished it would have a meaningful impact on something I value