You can set a target when you should sell it, but I believe that the price can still drop lower during this bearish trend. Buy at all dips if you can afford it, but of course you have to be very wise in managing your investment patterns as things may not go according to plan.
Of course I will continue to buy Bitcoin regularly even if the Bitcoin price goes up, because I will only sell my Bitcoins when Bitcoin reach
my desired target, and I think the price of $30k is still too low for me to sell Bitcoin. After all Bitcoin has proven to be very good
for long-term investments, therefore it is better in a bear market situation like now we continue to accumulate Bitcoin. Although as you said
there is a possibility of the Bitcoin price dropping even lower, but because we know Bitcoin can always recover and go back up in price,
so we don't have to worry if the Bitcoin price drops lower. What we need to do when the Bitcoin price drops, we can hold the Bitcoin we have
or if we still have extra money, we can buy more Bitcoin every time the price drops. So my advice never sell our Bitcoins at low prices,
because it will only make us regret if suddenly Bitcoin is bullish and returns to the ATH price.