You should have a long-term plan to invest in Bitcoin so that you can grow your wealth, but we can never determine the value of Bitcoin, however, if you have money left over from your income source after meeting the needs of your family, you can invest in Bitcoin regularly or weekly or monthly according to your ability. In this way, if you continue to invest for a long time, your investment will start to grow stronger.
It is your sole decision whether to extend your savings journey or stop after achieving the goal. One thing that is advisable is that never sell the entire investment.
Of course, you don't need to sell all your bitcoin investment because you have reached your bitcoin target and that is why it's called an investment because it should running for a long time with no plan of wrecking it. If you sell all your bitcoin investment and hold fiat, you will regret it because bitcoin price will continue growing and your fiat will continue depreciating overtime.
Selling too much bitcoin too soon will lead to regret, because it might take you back to start accumulating bitcoin. If you have more than enough bitcoin and you want to sell part of it, you can use the sustainable withdrawal strategy o tap some profit from our bitcoin investment once in a while and it wouldn't affect the growth of your bitcoin portfolio overtime.