Grow revenue via any legitimate means. Cancel any expenses that aren't required to run the businesses (SaaS accounts you keep around "in case I get around to it", etc). Obsessively document everything you do for the business; get as much as possible outsourced to people following the procedures you've written up, ideally without spending too much money on this.

Get your ducks in a row on numbers, most importantly the financials (bookkeeping bookkeeping bookkeeping) but also classic (SaaS?) analytics numbers like number of trials, conversion rate, churn rate, etc. Historical numbers and numbers segmented per traffic source/vintage are good things to have, too. Bonus points if these are pointing in the right direction over time.

In more detail: http://feinternational.com/blog/saas-metrics-how-to-value-sa...

I might also add "Negotiate the sales price, even if the buyer and/or broker does not want to negotiate the sales price."

Check out the post we [luckily timed!] today - http://feinternational.com/blog/how-to-start-planning-your-e... - some basics in the blog post and a short (free) e-course you can sign up to on what to plan, too.