It's been a funny sort of year. Normally by now I'd be complaining about dead cukes, tomatoes with botrytis, the plague of spider mites and emptying out the greenhouses, this morning I was stringing up a second cordon on the sungolds.
The veg patch itself though has been enough this year to make me rage quit and I'll be returning it to lawn.
Just to play devils advocate a bit; if you're not happy with the plot now do you know why? Is it the lack of return, the work required, the time needed or have your interests change. If you don't know why you're not happy, doing nothing about it may just end up with you being in the same position Sept 2019 resenting wasting a year fighting with the plot.
It's perfectly fine not to want to spend hours weeding, lugging poo around or picking slugs out of your lettuce, if you do give up your plot you shouldn't see it as a failure at all. You had one, you enjoyed it and then you passed it to someone else to do the same.