I think from the bear market i realize that we mustnot buy at the same time and only 1 coin. But buy them in some stage. Example you have 1000$ you want to invest. You can invest 200$ first after that you can make a step again after you already see the situation and condition in the market. So when the bull market already in its turn, you can get a profit.
One of the most powerful moves in stock and crypto trading is to average in. And if you only have 1000$ it would be even better to add 50$ or 100$ every week over going all in.
And the same when you going to cash out. Than you simply average out from the trade. Unless you are happy with the gains and going to cash out 100%