Evergreen funnel not converting as well since Thanksgiving

Hi! I started an evergreen funnel for my online program the 1st of October. I had a 50% show up rate, 33% promotional email open rate, and 10% conversion rate up until a few days before Thanksgiving. All my stats are currently the same, except conversions. My ad cost went up significantly during the election, so I increased my ad spend to get more people into the funnel, which is still working well. My issue is my conversion rates have decreased quite a bit. I’m wondering if it’s the time of year and if I should keep everything as is and re-evaluate mid January, or if I should change something. I’d love some advice on this.