Went from being able to run around 10k to finishing the race

I am British Military, not front line or SF. I am 5’7 currently weighing around 68kg. Lately I moved on from Athlean X which I followed for most of my training life and moved onto your programming which i discovered looking for an ultra marathon plan. I do a yearly charity fundraiser trying to do something impressive endurance wise to maximise donations as the charity is a personal thing for my family. The first was a 50k, 2 years ago. I used your 50k plan and went from being able to run around 10k to finishing the race. My IT bands gave out at around 30k and I was the last one accross the line, but i crossed the line. This was the 1st official race i attended and I finished an ultra thanks to your plan. I also used your mountain marathon plan this year to do Man Vs Mountain accross Snowdon this year. Finished that one in a much better state.