i bought bitcoin in 2016 and forgot about it.

hey, I bought bitcoin in I believe 2016 oct for around $500 and one of colleges are very intreasted in investing and crypto. Yesterday around lunch time we somehow started talking about crypto because he mentioned that the price of bitcoin has reached the highest price ever. I didn't think more about it but after work I started thinking and remembered that I might have bought some bitcoin a few years back. I charged my old laptop that I havent used in ages and booted it up and there it was. Apperantly in 2016 I had bought a bit over 1 bitcoin. Which is worth around ~$119k at this time im writing this. This amount of money is life chaning and will really help me and my fiance.

So my question is now. How do I sell this for real money without getting scammed and is it tax on crypto?