don't look at this as a regret story, just see it as a valuable lesson that you've learned and gained a lot of experience doing it. what you had experienced wasn't the first and won't be the last either, we will see it repeated at least a couple of times in very similar manner too.

just know that only because price drops it doesn't mean it is the end of bitcoin! bitcoin is just getting started and is inching closer to mass adoption while being far away from it.