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trying to structure my training really turns me off
You can have a fairly unstructured-but-still-structured training off 3 runs a week - 1 long steady run, 1 short tempo / race pace run, and 1 speed work run.
The speed work doesn't need to be militarily run intervals with times laps and rest periods - you can just fartlek it - Go for an easy run, but put in some hard repeats where you run til your lungs turn inside out, recover a bit, then do it again.
Did this and got a 21:07. I think it may take me a year to see if I can 6 min/mile one. I'd like to run a sub 20 this year. That should be achievable as I'm not in great condition. I also only really want to run 2-3 time a week.
What I have worked out is that trying to structure my training really turns me off. I may to too lazy to train in the best way. Think I might just keep running and turn up to parkruns every now and again. When I get to the point where I'm not getting any faster I'll think about my training then.