There are a lot of varying opinions on this.
Generally, throughout history (for as long as we’ve known and across all cultures), protein varies between 12-18%. It’s not a huge range, so generally, 15% protein is fine. That said, higher protein diets are generally more satiating, so several studies appear to indicate that higher protein diets contribute to weight loss. For my part, I think keeping protein anywhere between 15-25% is a pretty good target, and there’s a lot of great research and anecdotal reason to believe that we should cycle protein consumption (some days higher protein, some days very low, rather than keeping it constant every single day).