Position size
Size against the distance to your breach level, not against the account size. This is the calculation that keeps evaluations alive.
Not the account size — the distance to the level that closes the account.
$10 for most USD-quoted pairs on a 1.00 lot.
At this risk a run of five losers — normal for almost any strategy — leaves you close to the level that closes the account. Most funded traders size between 0.25% and 1% of the distance to their limit.
Risk amount divided by the stop distance in value terms. For forex the value per pip per standard lot is used; for futures the tick value per contract. The result is capped by the distance to your breach level, because a position that is correctly sized against the account can still be wrong against the rule that closes it.