So I can't help but wish I had just held on to my BTC. Would have been grinning from ear to ear today. #Lessonlearned
Day trading or short term trading is not for everyone and requires a certain skill set as well as mental control. Although you say you've learned your lesson perhaps what you have learned could be used to have better results again in the future, you've identified that you buy too high so try and correct this and be even stricter with what price you buy at.
They usually feel they can just gamble their way into trading, make some decisions that they feel could be right and then end up being wrong.
They are always the FOMOs most time looking for the coin that is rising and then trying to quickly make some gains and just like the OP ends up being bag holders.
Anyone who wants to trade very good, should first consider the kind of coins they want to trade, then always look for the best position and then have patience until they hit with some strategies too, in case they are losing.