First of all, sometimes writers just need a brake. It is okay to go through a season of not writing. However, if the case is that you want to write again, only you can't find the time or motivation to do so, there are things you can do to help.
If your too occupied, yet still are able to write, multitasking is sometimes the only way to get anything down on paper. I always carry a little journal with me where I can write my thoughts down if I need. Write on your lunch-break, in the bathroom, or on any chance that arises. If you want to be writing internet content, getting up an hour early or staying up an hour later may be necessary.
In the end tho, finding the time to write is a matter of prioritising. You can't make time out of nothing, so you have to take time from something else. It could be watching one less show, doing chores before leaving the house, or staying in instead of going out.
One final tip for writing on the busy schedule is this: buy a mini digital voice recorder. Record the ideas that randomly pop in your head. This way, at least you can keep them for when time becomes more available, and you can build from it. If you think about it really, we probably lose out on so much good content simply because we forget. So make a note to self so you can visit it later.
If you find yourself too depressed but still have an urge to be writing, the hardest part of getting back to writing is, well, starting to write. In the same sense that it may be daunting to start math homework, do the dishes or make a dreaded phone call, writing may instill that same type of fear in even the best of writers.
I have confidence in word flow. What I mean is, once your fingers start typing, words begin flowing. Write what you feel at first, even if it's nonsense or words that aren't even real.
Even then, everyone has little things which seem to lube the finger joints into working condition. My grease is music. I'll usually listen to instrumental bands such as Explosions in the Sky, and I'll open like a champagne bottle; releasing my angst and filling blank pages with the fruits of my creativity.
But. You. Have to. Start. Line your fingers up on the home row, grab your favorite pen or pencil, or open the apps on your smart phone. Now you begin to write.