I bought a bitcoin what 0.0003 BTC last year November with only money that left with me when I finished my program and named it investments, many of my friends started laughing that my money has gone and bitcoin will fall and is out of surprised bitcoin moved to 19k, 20k, 30k and 40k, so I'm excited for having double of my btc within some months, I want to know if I will sell it or withdraw it, because is a investment money not for spending.
If you still thinking bitcoin price will keep rising up then you just need to buy more and don't forget set a target.
You should set a target when you buy the coin to determine when you will sell it otherwise you'll lose your opportunity to sell.