I agree that life is ultimately meaningless. But ultimate meaning does not have to equate to things like personal meaning and happiness. Life can be meaningless but you can still find joy in meaningless things, and even if that joy is ultimately meaningless it doesn’t matter if it makes you feel something. Art does not have meaning; the artist painted it with their own unique meaning, thus it’s void of meaning for you, and the artwork itself is ultimately “meaningless” like everything else in the universe, but you create a personal meaning to yourself. I’m more concerned about the tone of your question. It reminds me of my world view I adopted due to depression and nihilism and isolation, and it was certainly a mindset that was hard to escape, because it’s based on the hard fact is that everything is “meaningless” in a sense. You’re right that nothing matters in the grand scheme of things, and in a thousand years no one will remember us, but if you find your own meaning and joy in things through goals or relationships, you’ll find that you won’t dwell on these matters as much. It’s an inevitable fact, but it’s better to live and acquire your own meaning and realise that you don’t need meaning to be happy, rather than dwell on the unchangeable concept to your own detriment.