That sounds like me 10 years ago, I had 4 weeks from the first few running paces I had done for 35 years and gave myself what I believed to be the impossible target of the local 5km race in September, it may have been 6 weeks my memory is hazy, its unimportant.
Soon I was running 5km and thinking about possibly trying the 10km race, my docteur said definitely not which was all the encouragement that I needed!
Not long after I found that I could actually run 10km albeit with some stopping but 5km by then was relatively easy.
I signed up for the half marathon, my target time was 2 hrs 40 minutes and I did it in I think 2 hours 20 minutes and the time dropped each year after that.
I am up to 12k again but with several stops, a half marathon seems like a dream at present.
Your 6 week thing will be a good time to review my progress, I just hope that it gets back to feeling normal again because its hell at the moment but I have the mental knowledge that it will be better, the last time I started from scratch again was after sepsis, I was very weak but still an athletic weight, its the 10kg that is holding me back.
Sleep is very very important and good quality sleep as well, if you buy a runners watch or any fitness watch it will monitor your sleep time and more importantly how many hours deep sleep and how many light REM sleep.
I knew that I had not been sleeping well since the confinement, the isolation and also the money concerns, since I have finally got the government support and know that it will continue till the end of the year I am sleeping much better, last night I got 4.5 hours deep sleep as opposed to 1.5-2hrs normally and I can always feel the results the next day, any injuries aches & pains just dissapear whereas they linger and get worse when sleep is not good.
Editted, so much for the 6 weeks, its been 11 weeks since I restarted 🙁
Maybe I should count the 6 weeks from when I got my mind straight and my mojo back in which case its only been 2 weeks!