What do I do next? I have no idea what to do. Ah…what? I have no clue.
Take a breath (or several) and give yourself some credit. When you think about it, you really do know what you need to do, whether that be personal or in business. 
A Little Prompting/Encouragement:
Maybe it’s some alone time (after those breaths), a conversation with a friend or colleague, a little gentle prompting, or maybe it’s something you’ve read or heard (podcast, song, etc.) that gives you that sense of, “Oh, yeah, I guess I really do know what to do next.”
Being Ready:
Then again maybe you’ve heard those words of encouragement and workable ideas over and over, but weren’t really “ready” to hear (and to really listen) them, and subsequently taking action was a no-go at that particular time. It’s okay. We’ve all been there. I can attest to that. Then there’s something/someone that gets that fire burning again and you move forward with new vigor. In fact it was a friend of mine who brought this to my attention after talking with her. I’d been in a bit of a “funk”, and after speaking with her it dawned on me that actually yes I do know what steps I need to take next.
With Business:
Actions as simple as calling/emailing a potential client; cleaning out your inbox; cleaning the clutter off your desk and off your virtual desktop on your computer to allow for a more organized space to work from can jump start your day/new endeavor. You know this stuff has to get done, so get busy.
Personally:
Calling a friend to catch up; doing some initial research about a new career you might be interested in; calling an agency/provider to get information about caring for an aging parent; drinking one more glass of water a day; eating a banana instead of a candy bar; going for a walk instead of watching yet another cute kitten video online. Some of these actions are simpler than others, but all are certainly doable.
These seemingly simple acts of “doing” can be a catalyst and stepping stones to move further on with an idea, goal, lifestyle change, etc.
Getting started…that’s the important thing. Have some confidence, believe in yourself, take those small steps, and then be proud that you took them! Then take another, and another. You’ve got this…one step at a time. See…you do know what to do!