Before you read our review, please note that your capital may be at risk. Only trade with money that you can easily afford to lose.Plus500 UK Ltd is UK based. Plus500UK Ltd is authorised and regulated by the Financial Conduct Authority (FRN 509909). Then you most probably trade 1 lot per trade and withdraw your win every single month keeping account size stable.
I am not suggesting that you follow the same plan, but you should figure a number that is not too risky for you, but which allows you 1) to compound the account and 2) to pay yourself. Unless you have a very specific reason to withdraw any money, keep ALL your profits in your account and trade it.