You can self-verify ownership of your website on your Mastodon profile using the "rel=me" HTML code found at Edit Profile > Verification, as described in the recent post at https://mstdn.social/@feditips/108714877848316982
However, if your website contains more than one link to the same Mastodon account, these multiple links can confuse the verification process. (For example, if you have a link to your Masto account in your page's header and also in the page's body.)
If the verification doesn't work, try removing all of your site's links to your account except one with "rel=me" in it.
After the verification has happened, you can put the site back how it was, as the verification only happens at the moment you press "Save changes" on your Mastodon profile settings.