Today I improved my personal best by 1km/h.

To be fair I was well rested and since the heatwave is over I didn't have to fight the environment as much (although it rained and I was properly soaked and heavy).
Also I looked up how to properly move while running yesterday and I realized that I had to include my upper body more into my movements. Using my upper body more is still a thing I have to consciously decide to do but I'm really excited that it'll soon go into my muscle memory and I'll naturally move better.