Considering you could have used the money to buy bitcoins and essentially double your money instead, what purchases did you make this year that you are now regretting?
I have bought a new laptop on middle of this year when price per bitcoin was around $400 and i spend $800+ for that new laptop. However i already had one laptop working just fine, so i think that was my mistake to spend those $800 in one laptop, i should have bought 2BTC around with it so that i can now have both laptop and $800 sitting in my balance. 