I made a mistake several years ago to sell a bunch of Bitcoins for $28,- each. Early 2013. Only a few dollars profit. Bought it much higher few years later but never sold again 
That is actually sad but the thing you should be celebrating about is that you bought it again instead of regretting and weeping. People make mistakes but only those move forward who dont give up after falling down. Also, it is not very late if you ask me.Far future predictions show a very high value of this digital currency and by watching that, I count all the present investors as early birds. I wish you best of luck and keep buying BTC.