You could always change your title from something like "CEO of XYZ Co.", "Founder at Acme Inc.", or "Chairman of Dog Corp" to something less ambitious like "lead developer", "marketing manager", or even just "web developer".
Sure, occasionally, you might get employers in the valley who (claim) they care a lot about your personal growth, but from my experience outside the tech world, plenty of employers would much rather just have a dull but trustworthy tool who gets the job done without fail to someone incredibly smart, unscrupulous, and motivated. To these people (which I will venture to say is the majority of small-business owners), your ambition is scary to them, so you're better off not coming off as being ambitious.
TL;DR: best way to market self-employment? Don't. Instead market it as regular employment where you had a lot of responsibilities.
Sure, occasionally, you might get employers in the valley who (claim) they care a lot about your personal growth, but from my experience outside the tech world, plenty of employers would much rather just have a dull but trustworthy tool who gets the job done without fail to someone incredibly smart, unscrupulous, and motivated. To these people (which I will venture to say is the majority of small-business owners), your ambition is scary to them, so you're better off not coming off as being ambitious.
TL;DR: best way to market self-employment? Don't. Instead market it as regular employment where you had a lot of responsibilities.