If you were once on the glideslope and you deviated from it 500ft above you should have gone around because you have gone beyond half scale deflection of the glideslope bar. If ATC vectored you to the localiser above the glideslope, which does happen sometimes, you could level off and ask ATC to give you a 'box' pattern around the ILS to re-intercept several miles behind you. Also you could try increasing your rate of descent but whether or not that is a good idea depends on how far you are from the runway...its not really recommended.
By the way this isn't really the right forum for this question...it belongs in tech log or maybe flight training.