The problem with fixed answers to the meaning of your life is that the situations within which you are immersed keep changing. That is a desirable thing if you can cope with them, but undesirable if they overwhelm you. We find our life to be interesting when we step just outside of what we can control and play with the borders of what we know in an effort to bring them within our ability to control.
An artistic painter or a gardener at their respective self-chosen tasks are each having a conversation with their respective mediums. They each do physical things and observe how their medium reacts at the moment. Each of these workers then makes whatever adjustments are needed to move the conversation along to something closer to a personally fulfilled life experience for them.
After some time the painting or the garden changes into something the individual hoped would be valuable for themselves and possibly to others. Their actions are progressing toward a generally perceived goal. Neither of these workers knows exactly what will be there in a minute, a day, or a year, but they do know generally what it will be, and they know generally how to modify things at the moment, and the next moment, so the completed product will be as close as possible to their ideal.
In this view, the meaning of your life is created every moment that you are trying to accomplish some task. It can be a meaningful self-chosen task or one imposed by others or by natural processes.
The most meaningful life work is doing something you feel is important where you can participate in its completion.