As you said there is high risk in making high profits but it does not exist where the factor changes. The factor of unstable prices can be determined by doing market research as we have seen that alteration is a part of coin but later on we get profit as a result of high ups in its value. It happens as a result of holding your coins for a long time; if you are not holding then the profit may be less. Otherwise, holding is a best way to make high profits.
If it was so easy to know when the market is going down and when its going up then trading would have been much easier and everyone would be trading rather than doing other work to earn. TA is something that should be taken with a large dose of salt. Things like these dont just depend on trends that are being set but also on news that makes the market move.
A good example is the recent Binance hack that led to a loss in the BNB coin. BNB itself is a nicely disguised ponzi scheme but hey, whatever makes you turned on - right?
Hence take future speculations lightly and not as advice. Its better to be prepared for worst case scenarios.