Well, maybe one or two simple things!
Google, Bing and Yahoo search are constantly scouring the web to see who has fresh content and who doesn't. When something is altered or added to, you get some points for that. The points can add up when you do it more often!
Adding a photo or retagging photos is one simple way of showing the algo-bots that you are alive and kicking. It shows that content is changing and being refreshed.
Rewriting a few paragraphs or adding another few lines to any blog or written content also is a positive sign and will improve your ranking on SERPS (Search Engine Result Pages)
Here is a bonus 'thing to do'. In your blogs or webs, add hyperlinks from one page to OTHER relevant blogs and internal content on other pages. Really helps your ranking! Look at news web sites. They all have hyperlinks to previous posts and related articles. It's informative and offers relevant details. Here is an example:
So if you are experiencing 'white space' (see Lottie Kendall's piece here), well you have something that you can do RIGHT NOW!!
Instead of fretting about and experiencing that blank look we seem to get when all things appear going to H E double hockeystick, you can do something productive!! Beats that body freeze I've been getting lately worrying about everything!!
So start by going back to the very beginning of any blog history and start there. That first old blog has certainly been forgotten, hasn't it? Update some of your thinking, add a photo or two, insert a link to something else, and BINGO. You have done something quite useful...
Do the same for your website and you will start noticing better traffic stats and up your chances that you will be found!