By this stage of the Seven Card Stud Hi/Lo hand, you have four of your seven cards so if you are going to make a low hand you would want at least three low cards. You can see by how many low cards your fellow seven card stud poker players have as to your chances of making it.
If you are going for high and can see that not many low cards are out there, your suggested Seven Card Stud Hi/Lo Poker Fourth Street Strategy is to bet aggressively as you can scoop the pool.
You should also do same if you see alot of high cards there and you are the one with the best shot of making your low. This online poker strategy is sound as you want to build up the bigger half of the pot that you will eventually split.
You should be the one driving the betting otherwise your the other players at the online poker table will run over the top of you.
At this stage you are going to be drawing towards something. You don't want to be in the situation where you are still drawing for the hand at seventh street. This is a common online poker strategy mistake. Seven Card Stud Hi/Lo fourth street strategy require patience. Given this, the more early laydowns you make the better off you will be in the long-run. With experience you will see what hands are worth pursuing and what aren't. Besides the cards and the amount of people at the table, chip stacks and position will also influence your thinking.This analytical ability will improve over time as your develop a better feel for the nuances of the game.