Is it possible that something has no purpose or cause? In that life has no purpose or no cause, it just exists. The same with the universe.
Or everything has a cause or purpose, it's just we don't know it, either because we don't have enough brain power as a species, or because humanity hasn't advanced so far yet.
I've found an answer to this question in Aristotelian ethics. Thanks everyone for answering.
Yet, if action A is done towards achieving goal B, then goal B also would have a goal, goal C, and goal C also would have a goal, and so would continue this pattern, until something stopped its infinite regression. Aristotle's solution is the Highest Good, which is desirable for its own sake, it is its own goal. The Highest Good is not desirable for the sake of achieving some other good, and all other "goods" desirable for its sake. This involves achieving eudaemonia, usually translated as "happiness", "well-being", "flourishing", and "excellence".