graph on coinmarketcap show value of ethereum in one year block. which tells you when to buy and cash out

 I bought my ethereum at its highest point in 1 years block of time... talk about bad luck.
I bought on dec. 5 2024
This chart was on coinmarketcap for ethereum

the value at that time was $3,792 and today, a month and three days later, its value according to this chart is $2,647...... thats lost almost half its value since I bought in..... a lesson learned