In this case, I will use experience as a criterion. If you are an experienced trader, I will advise you to trade up to 10% of your income. Because an experienced trader has a higher probability of earning and I believe an experienced trader will not lose all his money because he has a lot of knowledge about trading and also knows how to control his emotions, due to which his chances of losing are low. If you are a young trader, I will advise you to use only 1%-2% of your income. Because it is impossible to get back the money you use to trade. Because even if you make a profit, you will lose to emotions because you are not experienced. Although the same thing does not happen in all cases.