The phrase "a more dedicated" is correct and usable in written English.
It can be used when comparing levels of dedication between individuals or groups, often in a context where you want to emphasize an increase in commitment or effort.
Example: "She has become a more dedicated employee since she started working on the new project."
Alternatives: "a more committed" or "a more devoted".
The value of a large aggregated audience remains unclear compared with a more dedicated one.
What if Moore had turned out to be a more dedicated campaigner?
Having now approached the restaurant in a more dedicated, critical way, at normal dinner hours, too, I'm left puzzled.
Ms. Bell's oil sketches and Tonalist paintings deserve a more dedicated following, as well as more art historical scholarship.
Weiss says, "I was surprised to find I had a more dedicated Internet following than I thought".
A more dedicated songwriter might tell a few more stories, or get specific about a pretty face, but that would be a very different artist.
Though O'Neal won four championships - a total that places him among the game's greats - we will always wonder how much more he could have done had he been a little more accommodating, a little more dedicated, a little less antagonistic.
I saw other actors and thought, 'Yes, you're a bit more dedicated and a bit more serious and a bit better than me.' So that was a little knockback.
If the device were a tad less ungainly, if its two-inch rotating screen were a little larger, if its dual dedicated lenses were just a little more dedicated, then Samsung's experiment would be the more successful hybrid it really should have been.
Taken as a whole, the town is a handy place to get supplies and arrange back-country excursions, it's small enough to "do" in a morning (unless you're a far more dedicated shopper than I am) and it wisely keeps its profile low in order not to compete with the scenery.
Nor does William Julius Wilson — who has a son-in-law on the Chicago police force ("You couldn't find a nicer, more dedicated guy") — wonder why he was stopped near a small New England town by a policeman who wanted to know what he was doing in those parts.
