I'm incredibly unsure about my plot

So I'm a relatively new writer; I have some experience from short stories, but not that many, plus they aren't that good looking back at it. I started writing a bigger story (planned to be around 60k words) in the beginning of this year, wrote around 10k, then stopped for a few months, and recently I tried starting it again. However, I'm really unsure about my plot. I don't really know how I can tell if it'll be a good story or just a boring, unoriginal one.

How do you guys decide if the plot is good enough to finish? And if you decide it's not, do you change it, or do you just start all over again?