You look at these two services separately, but why not look at them as complementary? Tiktok is now used in most cases not as an independent platform but to gather an audience, some of which can become a potential clientele. To do this, you need to increase the number of subscribers because profiles with many subscribers often come up in recommendations. To promote an account now is not a problem. You can buy subscribers, there is a good deal of services, like this one, for example, famoid.com. And then, you need to put a link to the "main" site in the profile, so loyal viewers will follow it to where you want.