Josh:
To get yourself used to faster paces, you need to start incorporating more fast training. Start by adding “strides” or “pick-ups” (TftUA pages 168-169) into 1-2 of your runs. After you have completed 4 of these sessions to help you access some faster twitch fibers, add on a session of hill sprints (TftUA pages 179-183) per week and drop to 1 stride/pick-up run per week.
This will help you add another gear to your running and build some running-specific leg strength.
You might find this post helpful and motivating https://evokeendurance.com/forums/topic/aet-and-ant-too-close-together/
Scott