You bought BTC at $17k, $20k, $18k, $25k, $35k.
Now you predicted that BTC can go up to 70k for example.
Now you set a target for selling your BTC.
Could be like this. $40k, $45k, $50k, $55k........ $70k and above like $75k $80k etc

Now if you can do the math, you are always in profit. Because you bought at low.

If it reaches $60k, you are in a good profit. If it makes a downward turn, you can buy more at a low price and then set a sell target again.

If it reaches $70k then your target and prediction are reached. You are in profit.

If it goes beyond $70k, then you are in more profits.

Now my question is this. Do you wanna risk it all on one time shot and sell 50% of your holdings and then do whatever you want with the remaining 50%, or do you wanna make more profit like this? Investment is not a one-time buy and sell. It's a continuous journey where you need to keep doing it again and again in order to find the best opportunity.