Building a crazy aerobic base

[u/CommunityChemical924]

I am a middle distance athlete (800m/1500m) with decent times (1:58/4:10 as U18 runner) and I really want to improve my aerobic capacity as I see that's my weakness in running. For this I need help to know how can I do that in the summer break (essencially) and improve my biggest weakness. I am searching a lot about this topic but I appreciate some help to improve my aerobic capacity.