My tactic for buying coins:
Whenever I buy a coin, I study the current scenario of the coin.
Some time before buying the coin, usually a week, I look at the lowest and highest values it reaches.
For example, $BTC is highly volatile, but I know that the lowest is $90k and the highest reached $110k.
In other words, I won't buy at 105k because I know I'll make a loss. I'll buy at least at 100k or 97k so that if it goes down, I won't make as much of a loss, and if it goes up, I'll make a big profit.
This tactic should work for all crypto investors. Don't buy when it's high! Because you'll make a loss in the short term.
And if you do buy when it's high, don't despair! Desperation is what causes the loss!
The amount of coins doesn't decrease, but their value does!! If you make a loss, wait! Don't sell. Everything that goes up, comes down. AND EVERYTHING THAT GOES DOWN, COMES UP!
Better for you, long-term profit or short-term loss?
For me, profit is better, losing money is not an option!