but you should never sell the whole 1 bitcoin. Keep 0.25 BTC in a separate wallet and do not sell in for the next 15-20 years. You can save it as your retirement funds and you will be one of the richest people in the world after 20-30 years if you have just 0.25 BTC with you.
Am having some amount of bitcoin which am not really intending to sell even during the next bull run, while am having little amount of bitcoin which i know i will be selling in the next bull run, but the amount of bitcoin i will be selling in the next bull run is kind of small compare to the amount i will be holding.
You gave the OP a nice idea, but i think next time you shouldn't recommend any amount for him to hold, its better you just advice the Op to hold some amount of bitcoin, so its left for him to know the amount of bitcoin which he is going to sell in the next bull run and the one he is going to hold.
investing in btc at a young age is a great thing as long as you already know about the risks of investing in btc, but I admire you because at a young age you can buy 1 bitcoin I think this is an extraordinary thing and you are also very great because you have emergency fund for your need, I can only say I hope your investment is successful and successful.
Its a nice idea having one bitcoin at his early stage, but if he is still having more money which he wont be using in the future, then he can still increase his bitcoin investment, no amount of bitcoin holding is too much as long as you are not investing all your money in it, and you wont be using the money you invest in it for a long period of time, then no bitcoin investment is too big and also no bitcoin investment is too small.