Sounds like you're doing just fine.

Hours don't mean squat. You've got a good job. You're happy. One day you'll move on. No problem.

You're getting good experience now. Whether you have 4,500 hours or 9,000 hours doesn't mean much. Once you're past a few thousand hours, it's all the same. There's no such thing as he-who-dies-with-the-most-hours-wins.

More pilot in command experience will be useful, but you're working your way toward that in your present position, aren't you?

You can always keep active applications going now. If you're called for a position with a major then fine. If you're not, then fine...you're already where you're comfortable. Sounds like a no-lose situation to me.