Why You Keep Getting Stopped Out on Good Setups

If you keep getting stopped out on setups that then work, the setup is usually fine and the stop is usually in the wrong place. Three habits cause almost all of it: putting the stop where everyone else puts theirs, making it tighter than the coin's normal wobble, and choosing the position size first and squeezing the stop in afterwards.
Your stop is where everybody else's is
A few cents under yesterday's low, or just beneath a round number like $100,000 on bitcoin, feels like the tidy place for a stop. That is exactly the problem: thousands of traders read the same chart and reach the same tidy place, and a dense band of stop orders is a magnet, because it is where ready buyers and sellers are sitting. Giving the level a little more room — beyond the wick rather than beyond the body — takes you out of the crowd. Why the crowd gets picked off is covered in why the price reverses after hitting your stop loss.
The stop is tighter than the coin's normal breathing
Every market has a routine range. Ether can swing two or three percent in an ordinary afternoon without anything meaningful happening. A one-percent stop on a four-hour idea is not risk control, it is a coin toss with fees attached. Look at how far price has typically travelled against the trend over the last few days on your timeframe, and put the stop beyond that. A stop belongs where your idea is proven wrong, not where your comfort runs out.
You sized the position first
This is the quiet one. Someone decides to trade one bitcoin, finds the risk too large, and pulls the stop in close to make the number tolerable. It should run the other way: choose the stop from the chart, decide what you are willing to lose, and let those two facts set the size. Smaller size with a sensible stop survives the noise; large size with a tight stop does not, and leverage makes it worse by pushing your liquidation level nearer than your stop.
Before you move any stop, check one thing: are you being stopped out and then vindicated, or stopped out and then saved? Only the first is a problem. If it is the first, see what happened when the trade went your way right after the stop.