I am a short-term trader. I make multiple trades within a short span of time. When I book a profit, I move on to another coin for entry. Most of the time, I follow indicators on a 30-minute timeframe to determine the right time to buy a coin. I enter a trade and close it after securing a 3-5% profit. If it seems like there's potential for further profit, I close the trade and aim for more profit.
Following a 30 minute timeframe is not too long for short term trading. I usually only look at 15M-5M for short term or scalping because trades are made faster and more orders are placed.
Timeframes of 30M and above are usually for Medium and long term trading. Determining a profit of 3%-5% is quite standard and don't forget to use a stop loss to stop unwanted losses because it is important. and having reserve funds will be very helpful in an emergency.
i just usually use 1 minute time frame when the coin was freshly listed on the exchange and it prove to be more useful than the other timeframe, it depends definitely on the circumstance of the coin itself if the price fluctuation and price swing was happening so frequently using short time frame might be beneficial.
for those that long term usually longer time frame as you mentioned even looking at the all time high and the all time low already giving good impression about the coin if we about to invest into the coin.
thats the thing being trader just be flexible, if the situation forces us to have either long or short time frame we just follow like water flowing on the river.
because after all we following the market here and try to profit from the price swings.