Please help!

My mom got me a dry starter mix that looked and smelled to be part whole wheat part white flour. I followed the directions of 15g starter mix to 15g flour to 30g water. That was Saturday around 7pm. As of today Monday 7am it’s barely grown.

My house is on the colder side at 65F so I was expecting to see something more at the 36 hour fermentation but barely anything. I popped it in the oven on proof for an hour this morning and just left it in the off oven that at 80F. I’m praying when I get home from work it’s grown a little

My question is if it does not double do I throw it away and start over? Keep feeding it and praying it works? Any advice would be great!