This is some advice I got from another forum:

Yes you can take a clone from a flowering plant but it takes upto 4 weeks for it to revert back to veg and it is no worth it. But yes you can.

Is this true? The only reason I want to clone is cuz I don't want to wait to germinate and start from scratch with the summer solstice coming to an end. Gotta take advantage of the outdoor grow season now.

What should I do at this point?

I tried germinating the only remaining seeds I had that were from good batches but none of them wanted to take. I used the wet paper towel method in a plastic bag. All 4 were failures so at this point I don't know what to do.