Trading is not a fixed income, you can't earn 10% daily. Some time you would gain some profit, may be 10% or more and some time you wouldn't which is quite normal. Profit and loss also depend on market situation.
Yes, when you decide to become a trader, you must remember that now, the income will be not stable. Today, you can make even 20-30% profit, and tomorrow, the prices of your tokens can fall.