Although,as of January 2018 I never had any bitcoin or altcoin in my possession except ETH which was very little in quantity even though I had opportunity to buy and store those days in 2016 but did not.I was actually following up on happenings in the crypto world but never took the decision of investing heavily.

Answering your question, I would have regretted if I had bitcoin or other altcoin earlier in 2017 and I never sold in December of same year or January 2018. For those who sold then, I would say a big congratulations to them. I say this because selling off at those high prices in January 2018 and buying more during this low price period is this best thing that must have happened to any crypto investor. I'm optimistic that bitcoin would tremendously improve but when seem a bit difficult to tell for now.