I'd mow it, let it start growing well again, several days... Fry it, like 2 quarts of gly per acre or more + some additive like Ammonium sulfate or that water treatment (I can't remember off top of my head the liquid additive I use). Many will agree past 2 qts is a waste BUT since it's so cheap and fescue is hard to kill - I might even do 3 qts. Likely, if you have the time & $ (not much per acre) - you can't hurt it by spraying more than one time, like again in a month. ideally, something like beans in there would be great as well.