The time now became so bad for alts that I have sold many of my alts at break even. I had bought many alts with BTC and even though the price of alts has increased in USDT, they have performed poorly with respect to BTC. I sold many of my coins at break-even just to regain my positions in BTC. So you never know when to sell. There are some coins which I sold at 25% profit and I would say that's a comfortable price.
That's what exactly, you will never know when to sell but at least you have an aimed profit for it and 25%-30% is fair enough to get a profit when the market becomes a bull trend. I guess don't be a fool if you will sell your bitcoin at a lower price, you should have a wait when is the perfect time of selling since we all know the market was in sudden price go down or sometimes it will go up.
In my own, when you see profit in your portfolio, don't hesitate to sell if you really need it financially because for me, when I needed the most money I sometimes manage my portfolio selling a small portion on it.
A price target is necessary when trading to be able to hit the desired profit then do the math to all of it including the transaction fees and there you have it. But if you are tired of waiting to trade in the market you can use some bots but that would comes with a price of course.
Different kinds of trading always have a risk but you are the one who's making the decision to minimize the risk of losing. You should plan accordingly and never hesitate about your plans since it will help you along the way to earn a decent amount of money.