What's the best way to increase my conversion rate on Clarity?

I think 13% is good - that's what mine is too. I think the bigger issue is getting more people to your profile page. It doesn't matter how good your page conversion is if you don't send people to it from your website or email marketing efforts. it also depends on your per minute rate.

The only specimen you ought to measure your profile against is your own.

When you stop to think about it, you'll realize that comparing conversion rates across different kinds of profiles is misguided.

Supposing, just for the sake of argument, that 95% of Clarity.fm visitors are seeking advice about government grants whereas your area of expertise is government contracts, then your profile might receive a large number of visitors searching for "government" but see fewer call requests than profiles of experts in that unrelated area.

Is your area of expertise something sought out by 30% of Clarity.fm visitors or by 6%?

Are you 1 expert out of 1 for this topic, or are you 1 expert out of 50?

Do you respond frequently in the "Answers" section to help people in off-topic areas? I do. And that certainly dilutes my conversion rate! If I were more stingy with my responses and only showed up when the domain industry or brand names were the topic under discussion, then I'd have fewer visitors, which would lower the denominator and boost my conversion rate ... even though the number of calls would not have changed!

So much for comparing your conversion rate with that of other profiles. Also, the conversion rate is -- depending on how you look at it -- the wrong metric. If I cared about my conversion percentage, then I wouldn't be writing this sentence.

But there are some things you can try to boost conversion numbers (as opposed to conversion rates). Traffic volumes here tend to be low; so it's hard to do any controlled A/B testing. So it will be difficult to measure and validate any changes you implement.

The obvious answer is to look at rewriting your profile, since verbiage is the one variable you can change. I need to rewrite my own. Actually, short-form copy writing and editing are areas where I have professional experience and plan on offering services during 2015. So if you want some help or feedback on revision, just ask.

I agree with Rich that 13% is pretty good. At this point I'd focus more on how to get more people to your page with links in your other social profiles, writing guest posts with a link to Clarity, or something else.