Well you could have put it back. Sweet potato is pretty sturdy. ABSOLUTE KEY to growing is heat, Heat, HEAT. 85Â°F or above. 90Â°F would be better. Once it gets hot enough during the day, direct sun will provide the kind of heat you need. No A/C -- set up outside or garage or attic... Maybe your car parked in the blazing sun.
For me growing the slips is not the problem, it's the typical lovely cool night air in the 60's and threats of early killing frost and accompanying drops in temp starting around late September -- I can't count on heat-loving crops beyond then even if the subsequent days are frost-free until late October or November.
This year, late lingering cold spring delayed everything so I'm not very optimistic about sweet potatoes, but I put this extra late Hawaiian sweet potato in last year's eggplant SIP after the big broccoli were done.
...if this works, I might have to concede that I have to grow sweet potato under black plastic mulch when planted in the ground, and plant the slips earlier by setting up a low poly tunnel over the black-plastic mulched raised mound.