"Daytrading" and "4 hour charts" are a contradiction in terms.
Even "daytrading" and "1 hour charts" are very close to being a contradiction in terms.
"Daytrading" means not holding positions open overnight. "Overnight" is rather a vague term in forex, with the markets being open 24/5, and most active in different timezones at different times of a 24-hour cycle, but you take my point, presumably? Daytraders are typically using 5-minute and 15-minute charts. 30-minutes at most.
I suggest you read the famous Three Ducks thread - it's a solid and sensible method, whatever timeframes you use it with, and you should be able to find some success with it, if you have patience, discipline and appropriate position-sizing (most people don't, of course, so that's a big "if").