The real issue is not whether baking biscuits is meaningful, but the extent to which the activity can seem to be so after it has been continuously stretched and subdivided across five thousand lives.
For the rest of your life to be as meaningful as possible, engage in spiritual practice if you can. It is nothing more than acting out of concern for others. If you practice sincerely and with persistence, little by little, step by step you will gradually reorder your habits and attitudes so as to think less about your own narrow concerns and more about others' - and thereby find peace and happiness yourself.
Because we have for millenia made moral, aesthetic, religious demands on the world, looked upon it with blind desire, passion or fear, and abandoned ourselves to the bad habits of illogical thinking, this world has gradually become so marvelously variegated, frightful, meaningful, soulful, it has acquired color - but we have been the colorists: it is the human intellect that has made appearances appear and transported its erroneous basic conceptions into things.