I don't think there's a whole lot you can do but bump it. Depending on the genre/plot it make take a while until the right person shows up. Just like an ugly vase might sit in an antique shop for 20 years until the perfect old lady comes in and falls in love with it. Romance is very popular amongst 1x1 and that will never change. If you really don't get any bites you may just need to slightly change what you're looking for, maybe leave things "open for possibility" or something. Good luck.