I'd suggest you try meditation. It does not bring you instant happiness, but slowly brings about a sense of wisdom and peace that really resembles long-term happiness
I have, and you are right. But after a few years I used that wisdom to conclude I prefer a low average with a few severe lows and rare few extreme highs. The latter are great, but mostly it just makes me feel more alive, instead of like some monk serenely walking towards oblivion.