I work with carbazole and it alkyl derivatives, what reagent can I use to spray the tlc plate

UV doesn't show you your carbazole spots?

there are other faint spot that are present in the plate that is why I need a spraying reagent, please help!

Okay, so what have you tried? If you're not sure what you're trying to see and you can already visualize the carbazole with UV, I would start with the standard ones (or what I consider to be the standard ones), such as Goofy dip, KMnO₄, vanillin, charring with H₂SO₄ or an iodine chamber. If those don't work, you could look into something more exotic, although if it were me (and since you can see your other spot) I wouldn't waste my time and the group's materials with that.

thanks for advice sir, I will never fail to acknowledge you when I publish this work, but I will need your further assistance as I progress.