Finished Wk4D2!!! Should I rinse and repeat Week4?

Hey everyone! Just finished Wk4D2, am feeling rather proud of myself. Started on my Keto diet today, and was feeling rather low energy. Also, it was far far harder than day 1 because the place where I did it had a gradual incline for the entirety of my first 5 minutes. That meant that the last 5 minutes were absolutely brutal due to lack of energy. I was about 2cm away from calling it quits in the last two minutes but I somehow pulled through. Slowed right down though! I am now wondering, however, whether I should go through week 4 again. I'm going to do Wk4D3 on Sunday and see, but what does everyone think? Wk5D1 is supposed to be much much easier right? I'm just concerned I wont be ready for that 20 minute run on W5D3!

Also side note, people who haven't invested in running shoes PLEASE do it! Its such a help and it gives you one less irritating niggle when you're running. Don't just go to a shoe shop, seek out one of the places that films you running. They can then find the right support for you and it makes a world of difference.