Even if you are a hodler you should know when to buy a coin and when not to. You can double or triple holdings for your coins. I am not a pro trader or anything but I am far from a noob and know when to buy and when not to.
You can make 1000% gains 10 times but you only need to go -100% once to lose it all. Don't margin trade if you don't know what you're ding. There is a guy who went from 3 btc to 200 btc to 0 btc. Pls don't be greedy(Its hard in crypto but you can try).
Remember, bulls make money, bears make money, pigs get slaughtered.
The solution to that is not TA - it's risk management.
People who go all-in are idiots. There will be some trades you get wrong no matter how good you are. But it's not the end of the world if you practice proper risk management and only stake 1/10th of your stash on each trade. That way, even if you make a mistake, you are still in the game. You'll get rich slowly and steadily.