Your entire funnel needs to be optimized for mobile traffic.
I've gone to a completely video-based funnel for solo ads and my results have improved greatly. I buy a lot of solos and they have become 80 - 100% mobile traffic.
I have a video squeeze page which leads to a video training page.
Here's a screen of a run that's going today:
I haven't seen much below 80% mobile in quite a while. If you're not using video for solo ads you need to get testing!