So, I was given a gift certificate for a local camera store by the parents of our cross country team for taking and sharing photos for the season. Not why I take them but it was a really nice gesture. So my question is, what would be the best to upgrade? Lens or body?

Current body: Canon 7D (purchased used from a 'Fire member), Rebel T3i

Current lenses: Canon 18-135 STM, Canon 18-135 USM, Canon 50mm STM f1.8, Canon 24mm f2.8, Canon 70-300 USM II

I mostly do sports (T&F and cross country, landscape and wildlife). I don't do a lot of indoor sports, a couple of indoor track meets each year. I have rented the Canon 70-200 IS f2.8 for such events in the past

Thinking that it makes the most sense to upgrade my body, possibly to the 7D Mk II. Not interested in changing brands at this point. I am happy with Canon.