What you have initially in place might reheat after a flip or two, but that might well be it for heat from that material. It's energy depletes. It doesn't reheat forever with additional turning.

A whole bale of straw is a lot, sounds like you are short on greens. Any green will do. If you can't fit it in you could divide that pile into two, adding more greens of your choice (manure, chicken poop, grass clippings, coffee grounds) to each. That would probably generate heat again.

Karen

Miracle grow isn't a good choice, but something organic like blood meal would be OK, and a small volume at that

Karen

I don't know why I forgot about using myself.

Once the sun goes down, I'm going to go start pissing in my pile. Urine... it's sterile, natural, and high in nitrogen.

Wish me luck!!

Better start drinking a lot of beer now. You might need a lot of pee to balance out a whole bale of straw.

Karen

Do you think apples will work as a nitrogen source? I've got hundreds on my tree that I know I can't eat and I don't want to put them in if they will be considered brown.

BTW, I've did my deed in my compost pile a few hours ago. :)

As the Nitrogen is used in the composting process that limits the amount of food available for the bacteria that process the Carbon and over time the compost pile that once was hot will cool off. You want that to happen, or you would never get your compost into the garden.
If you add more of a high Carbon material you will need to balance that with some high Nitrogen material.
Miricle Grow is a water soluble source of nutrients, meaning that what is not immediately taken up be plants flows out of the soil and into the water supply adding to the pollution of our water.

Urine is a quick way to balance lots of carbon. Our pile gets very hot and that is our secret ingredient. Actually, we are more often short of Browns.

Cover the pile with grass clippings. It will heat up in no time.

One thing you left out in the original post is the amount of time involved. How much time passed between when you started the compost and when it got hot? How much time between then and turning it? How much time before you then decided it had cooled off?

It could be that what you saw was the normal composting cycle and you added straw to almost finished compost. Maybe if you had let it decompose a little longer, you'd have had some nice compost ready to use. Since you added the straw, you'll need a nitrogen source.

I'm not sure if apples will provide much nitrogen. I think they're mostly sugar and water, but I seem to recall reading that fruits and vegetables are considered greens.

Any chance of picking up coffee grounds from coffee shops or restaurants? Starbucks has a corporate policy of giving them to anybody who asks, but other places may be willing to save them for you also.