Which embassy are you applying with? Some of them are asking, even with a Ltd company, that it’s been incorporated for at least a year before applying. If you’ve only recently registered as a sole trader I’m assuming you don’t have a self employed tax history which is what I’d suggest sending with a covering letter
This was pre-DTV. Just saying that true money required more thorough documentation and updating them every 6 months. It then rejected my passport for no apparent reason and closed itself with my money!