When my GMC terrain 2014 seats over the weekend it will not start what could be

What is your question?

My 2014 GMC Terrain will not start after it sets all weekend We put a new battery on it but it still won’t start after it sets for a couple of days What could be the problem

What makes this problem better or worse?

Starting it everyday

How long has your 2014 GMC Terrain had this problem?

2 months