In 2017, I knew about Bitcoin, how this was very booming at that time, so eager to buy, but at that time, I had no money to buy 
In 2019, I tried to buy a small amount, but the price at that time the price was dropping. what I did do? I panicked and sell them at a loss, and several times later the price increased again. silly of me, that is because of power of panic 

In 2020, after learning from previous mistakes, I bought again Bitcoin in small amount, keep them although it experienced several drops, and hold them until the price reached $60k. and I sold them. Yes, I was not a long term holder for several years.
And now, it is ongoing to add more because the market is still bearish. Hopefully, I can be one of the truely long term holders of Bitcoin.