Puppy doesn’t eat her meals

My puppy has been on Royal Canin since we’ve had her and getting her to eat it has always been an uphill battle. She’s 6 months old now.

I have looked into changing her food a few times but I’m just overwhelmed by the amount of information available and I have no idea what sites are a reliable source.

I have been looking into Butternut Box but I don’t know if this is nutritionally good for my puppy? Please could someone advise resources on what I need to be looking out for in terms of ingredients or nutrition?