I don' t think that using faucet should be considered an error. I made made 0.1 btc over the years with freebitco.in (and I have very few referrals). Look at my personal message if you didn't know this faucet, and please use my referral.
'Over the years' you made 0.1 btc when it was worth about $40? Instead, you could have bought 0.1 btc for $40 and used the time to do real work.
Most of the common mistakes of bitcoin holders are they always do panic selling. Most of the bitcoin holders are panicking if the price of the bitcoin is going down. They will sell immediately their bitcoin because they see that the price of the bitcoin is going down. I can say that that is a bad idea.
Most of the bitcoin holders hold, the traders sell for a quick profit.