Why doesn’t he RISE?!

I’ve been here several times and I followed a users help and the sourdough seems to be doing WAY better! The only issue is that he isn’t rising. Mr Danny Dovidough is really sassy and keeps refusing to get off his lazy butt!! The smell is noticeably better and not like vomit, and he’s getting hungry throughout the day. He’s forming few small bubbles but still bubbles, and he hasn’t even risen a bit. I’m concerned that it may be a bit too cold in my house cause it’s been snowed over for about a week now, but I’ve tried many places and still nothing!