Not getting smooth prints(has brittle looks). Can it be an issue of Filament Quality?

[dimensionfactory]

When I started printing first on my new Ender 3 V2 with no prior 3d printing experience, I was getting nice prints. But now the print quality has is so deteriorated I can't risk printing bigger models.. The prints look very brittle in nature.. I don't know what exactly it is called, may be under or over extrusion. Please suggest what to do to get rid of such prints!!