No matter how much capital do you have, trading is never risk-free. There is no full-proof strategy that ensures only profit.
Yeah, it is possible to limit the risk by putting right Stop loss. Also, the favourable risk-reward ratio also helps to trade with minimal loss. Trading is a skill which has many aspects. Probability of winning is also one of the major aspects. Trading with a good risk-reward ratio will help to be in profit always in spite of having poor winning ratio.
Eg: If you trade with 1:3 risk-reward ratio, and you have poor wining ratio 3:7(you win only 3 times out 10 and lose 7 times). Then also you can earn profits. because you earn 3*3=9 and lose 7*1=7.
So some strategies like this can help you to be in profit but again Trading is never risk-free.
You can only win in a single trade if you hold it and wait fof your expected outcome. By that, you are able to hold the coin for certain days, months or even years. However, it is not possible to have no losses in market unless you really see the future. We cannot prevent our loss even we have the effective strategy applied in trading. If we want to earn, we have always to risk.
This is not trading. this is just holding or you can call it a long-term investment. If you hold for a coin for 3 year and still you are in loss then?
Eg: Many people who have invested in BTC @18K or any other coin during 2017 Boom are still in the loss. Is that you called it trading?
Trading means earning more profit than Investing in 1 year. So putting SL is very important to preserve your capital. so that you can invest in any other coins at right time to grab the opportunity of make profits.