Friends what will you do with your cryptoassets?
Always make plans ahead, so that you dont get confused when things like this are happening. Its best to take actions early, have it in mind what to do every time, whether to sell your Bitcoins at a certain rate when the price starts to fall or to continue holding it till there is a change in the market. If you have lost a lot, then its best to just leave your money there, cause selling it wont make any sense.
Yes. Learn from your mistakes. That's rule number one. Everyone had their own story in this year (and maybe lets add in last years December into that) and we all lived in a different life in a different situation so what I learned this year doesn't really mean anything to you because what I learned is so much different and doesn't apply to what you have been this year.
Hence, everyone had their own mistakes and their own problems and all should learn from it. If you can go back to the whole year and without any hype or emotions just check without any doubt what you did wrong and where you did wrong, you can improve it next year. Even if 2019 is not a good year, you have been in a bad year and learned from your mistakes so your 2019 will be alright without any mistake you already know how to avoid.