Really sorry to hear you sisters are going through this. I'm also a little bit taken aback, cos i've not heard these cases before. I was in London a few weeks ago, and then also Manchester, and i met alot of single brothers that did NOT have the mindset that you sisters are mentioning.
They werent necessarily set on the "white" idea, they also didnt mind someone that wants to be "just a housewife". Career credentials were not that important to them. From the brothers that i met, most of them just want the simple life, and someone that wont give them "attitude".
I cant stress enough how important it is that you come OFF the matrimonial sites, because they're only going to continue to frustrate you and are not a fair representation of the larger populace. Most brothers on matrimonial sites are not necessarily serious, and if the sisters weren't there, they wouldnt be either.
Ever since i came off the sites i've been far more optimistic. If there is one thing you do today, i would recommend it is this simple set of steps below; - and i guarantee you will see immediately see light at the end of the tunnel.
1. Get together your contact list of all muslim people you know and you trust. Dont just limit yourself to friends, but go for associates, colleagues and people you have done business with
2. Put together a simple email to say "you are currently looking for a suitor" and provide some specific, but brief details of the kind of person you are looking for (this is a crucial step so dont miss this out. ambiguity evades action)
3. Then explain a little about yourself, and implore the person you are emailing that you "really need this assistance, and if they know or hear of anyone that is looking OR know of anyone that might be able to assist you in your search, to let you know".
IMPORTANT - Make sure you actively chase up all responses to your initial communication
Seriously, i tried this in October. I let go of my pride, and i started getting a response within a day. Speak to as many people as you can out of your own local and extended networks. Get as many people involved as you can.
I wish you all the best in your search. Truly i do. I am convinced you will start to see, the right kind of brothers are out there for you. Not every brother is looking for a white 21 year old. I assure you.
If you need any more tips. just ask.