You might want to check the minimum potential P/L in the market and move on if it is not negative, e.g.:
Selection's Trigger Expression market_min_pl is equal or greater than 0
Make a trigger with this condition, and set the action to "set user variable", say, "move_on" to 1.
In the next trigger check if move_on is equal to 1, if it is, then place a new bet AND set move_on back to 0.