Not gonna happen. Certainly not next week and that sort of improvement would put me at sub 26 minutes, which I doubt I will ever hit.
TBF - the improvement comes because I'm a really slow runner anyway (my last PB was just shy of 31 minutes for 5km) so improving on that was always possible. It never happened previously as I never really trained properly (if at all). I haven't this time either (I've barely run most of this year) BUT, I have lost at least 15kg from that last attempt, so I suspect the gain is mostly from that. The question now is how much more can I improve through training. I very much doubt I'll shift any more weight; in fact I will have to be very careful to not put any on.
My aim has always been to run a 30 minute 5km so to hit a smidge above 28 minutes this morning makes me very happy, but it has also kind of reset the bar; now I want more, but how much more, who knows. Maybe 26 minutes? Seems like a tough ask though. I would love to run a sub 1 hour 10km.