There are a few things you need to do;
1) Get those 14 Heroics Killed - Being a 14 / 14 Heroic Guild means you're worth potentially transferring to, so depending on your iLevel, extend the raids and get the kills. Chances are you have a high enough iLevel to kill the remaining bosses, and those hungry for loot are just going to hold you back. Get the kills, and then you'll get the recruits.
2) Move to 25 Man before Warlords - Being a 25 Man will help you practice and develop your raid leading and guild in preparation for Warlords. Waiting until then to get the 20 Man Team is a disastrous move. This obviously is much easier if you've got 14 / 14 HC.
3) Transfer Realm (Optional) - If your realm is really that dead, you're always going to struggle and that's no fun. The cost isn't nice, but when the choice is being stuck with mediocre raiders, on a dying realm little with chance of people transferring or being available, OR moving to a high populated realm with plenty of recruits, what are you going to choose?