Existence in general doesn't make any sense if you think about it.
But it's there, nobody can deny it. So the only sensible take is that we, as a species, are not as intelligent as we need to be to make sense of it.
Also, here's another banger for your brain: Try to think about the nothingness after death or before birth. Like how existence is there but you don't get to experience it.
Or how about this: If intelligent life didn't exist, all that stuff, time, matter, space, the galaxies, the stars, planets, etc, would be there completely unnoticed.
In the beginning God created the heaven and the earth.
That doesn't make sense either. Because who created god? An intelligent entity with magical powers popping out of nothing or creating himself makes even less sense than the universe that we know and creates more questions than answers. So you are not solving anything, even if you were right.
Expansion and contraction cycles makes the most sense which means no beginning and end. I would think that after all the stars are gone only black holes will remain and space will start contracting and all the matter will end up inside a singular black hole and the gravity will compress it to such an extent that it creates the condition for another big bang.
Each cycle will last trillions and trillions (and more) of years. That multiplied by infinite cycles of expansion and contraction negates the question of the origin or beginning of the universe.
Timespace is one thing but this still doesn't explain how matter or energy exists. Where did it came from? When was it created? What was there before it?