We could really only do so much with that too unfortunately. Unless you sent all the stems, another producer won't really be able to mix your vocals in that well. What that being said here's a way you could try to do it yourself. I would recommend soloing your vocals along side other tracks in the same frequency range (maybe guitars, some percussion, piano etc.) and listen for clashes. You can then lower or sometimes even notch out those clashing frequencies from the offending instruments with an EQ. Good luck!