Help me reduce the feral cat colony

In July of 2012, I saw a raggedy black and white cat in my backyard that looked sick, hungry, tired and definitely abandon. Having already three pet cats, I felt sorry for him and immediately opened a can of food and fed him. Needless to say, he inhaled the food and I gave him more. He was skeptical of me and would not let me touch him. So, I gave him his space. This went on for a few more days until one day instead of only him waiting in the back yard at the precise time I usually fed him, there was an entire cat colony! There was a male cat very much like him, a small female cat also like him and 2 grey kittens. He brought the entire family for dinner. Of course, I could not say no...
I love all animals but I have a special soft spot in my heart for cats. I am concerned that in the area I live people move away and just abandon their pets and unfortunately most of them that are abandoned are not spay or neutered. Therefore, our community is full of feral cats and kittens. I had to do something, and then, it started, the process of catching them all to get them fix and released back as they were all feral cats. Since then, I have trapped, fixed and released over 20 cats that just came to my backyard. I also feed them twice a day and when I can capture them, I have my vet (that graciously come to the house) check on them and vaccinate them so that they stay healthy. The cost of all this is huge and my vet suggested I create a non-profit organization to help me out.  She also told me that other momma cats will keep showing up. Therefore, Stonecrest Feral Cat Colony came to exist! We were established on June 2016 and recognized by the IRS on November 2016 as a tax-exempt small charity non-profit 501 (c) (3). We have yet been able to secure a volunteer to create our organization’s website and it has been as you can imagine difficult to raise funds. When a co-worker had to create a "go fund me" for another co-worker, I decided to try.

Any contribution is greatly appreciate and any extra funds will be shared with other cat organizations in the Dallas county area. The photo posted is of Henry and I one day before we had to let Henry go to heaven. I can't conitnue to support these expenses from my own pocket because it is too much, especially the vet bills and if I do not get help I don't know what to do.

I thank you from the bottom of my heart for any help you can give us!