I always sold too early....
My worst investment was Quark (in 2013)..... I bought 2 500 000 Quarks for 2.1 BTC @100 sat....
And sold at @350 sat for 8.5 BTC one month later......
I was such a fool...... one month after i sold, price was @20 000 sat per coin.

I could sell for 500 BTC ... but nevermind.....
Weed saved me... LOL
I can´t walk away from crypto..... I do believe I will hit some coin in the future.
Patience is the key.
I recommend to consider Monero.
However, as you said - it is important to hold it patiently. Buy some coins now and send them to your mymonero-wallet and come back 1-2 years from now. You might end up being a millionaire or even a billionaire (depend how many coins you are owning), in fiat terms of course even if bitcoin dumps big time.