How can I mellow the taste of this goat cheese
Have you tried anything involving cooking the cheese?

I have a feeling that some of the goatiest (not a word but it should be) goat's cheese is mellowed a little by heat. You could try thin slices on (part of) a pizza, or warming it, pressing it onto toast and finishing under a grill or with a blowtorch. The usual accompaniment to that would be a green salad including some strongly flavoured (peppery or bitter) leaves, which would also compete with the flavour.