Many, if not all of these things mentioned has also happened to my church (Wesleyan denomination). I started there in ‘81 and much in the area has changed.
While it was a predominately white, older church - it had a very large percentage of youth. As they grew up, married - they moved away - to the suburbs, and found a new, larger churchs there.
We were a slowly dying church; also filled with the older folks who lived in the area.
After slowly losing members to death, things down the road didn’t look to rosy.
After much searching around for answers, things began to happen.
A mostly black church that was meeting in a storefront, in an almost abandoned strip mall, was invited to use our building. It has worked out well, even though they lost some members. “Felt like we moved to Mayberry!” was the reason. ;^)
We now have a Hispanic (pentacostal) group that meets in our fellowship hall.
We’ve have had combined services throughout the year that are quite ell attended.
When we old, white, folks finally die off; GOD will STILL have a place in the neighborhood!
Let HIS kingdom grow!
AMEN!