Yes, acceptance is the key to serenity. I don't love the word euphoria as a constant state of being but I know what you mean and you know what I mean.

I write about acceptance and living life on life's terms, as you know. https://medium.com/channspirations/who-decides-what-is-fair-c252486bcad8 and https://medium.com/promptly-written/spiritual-prompts-for-the-week-of-june-12th-18th-86877724cd6b