You can still buy a coin during the time of the bull market and make a better profits than those that bought during the bear market. Some people buy a coin during the bear market thinking that they have bought in the cheapest price but after buying, the coin can still drop more and it continues to fall until it gets a lucky break during the bull market and that was when another investors or trader buys the coins. The market is full of surprises and you can surprised at anytime. Trading competition are good because they can make you to improve from the way you use to trade before, some traders are afraid of taking more risk as they are always too careful of how much they want to use to trade and this makes them to not get plenty profits but just average.
You are totally right - if you want to buy a coin for the future, you buy it at any price, having confidence that it will spike anyway, such as the case with BTC.
You either DCA your way out or buy in lumps, of course, with other coins, this is a more risky venture, however - it's better to have many coins in your portfolio with different potentials and metrics attached to them.