How to fix the problem when bluetooth is not available OS X?

I know it must be really annoying for you when you came across such a problem, and it certainly can’t be ignored considering the frequency of its occurrence. However, I believe I can help you with solving this issue, as I faced a somewhat similar issue few days ago, andI followed some steps to fix it.

Ironically, the steps are quite easier to follow:

You need to turn your Macbook off.

Wait for some time.

Turn the Macbook on.

Easy indeed!! Nonetheless, you are required to reset your PRAM to correct the issue in some cases. In those such cases, you can follow the following steps:

Cold reboot your computer (which includes, turn it off, wait, and turn it on)

The moment it begins to power up, hold down the following keys at the same time:

Option; Command; P; R.

I hope your issue gets resolved, as it fixed mine as well. Have a good day!!