The ‘Tap to Select’ text is in the standard .tile-footer so same concept above with using the .style-selections-list and either targeting it with overrides or :not() exclusions could work.
Without knowing what your other CSS looks like, you may have to adapt accordingly, but something like:
.style-selections-list .tile .tile-footer {
font-size: 0.8rem; /* either ensure a heavy weighted selector
or use !important sparingly */
}
As usual, this is not official guidance and the DOM elements could change in the future requiring you to update those selectors, but this is the broad concept.
Using your browser’s developer tools to inspect the ‘Elements’ (DOM) is a good approach for investigating this kind of thing: