I will go with the first regret you talked about, which is not purchasing bitcoin at first sight or not discovering it earlier before the half of the world knew about it,now it's quite expensive but judging by the way things are going its seems like there is still room to grow in terms of price, cause I doubt if anyone who ever invested in bitcoin ever lost their money, they all got good amount of profits in return, some got back 100%+ of what they  even invested.