Increasing Your Margin Available
As long as your account is not in deficit or you are not in a margin call, the amount of margin that you can use goes up when you add more money to your account. However, if you have a borrowing limit set on your account, your available margin will not increase above that limit.
If you have $2,000 cash in your account, you can usually invest up to $2,000 with margin. If you increase your cash portfolio value (minus any cryptocurrency positions) to $3,000 by depositing $1,000, your available margin will typically increase to $3,000. However, if you set a $2,000 borrowing limit, your available margin will not go up regardless of how much you deposit.