Inspire.com is an online patient website, with different communities for different issues. There is a community for uterine cancer, but I don't know how often people post.
There's another resource that isn't exactly on target, but could still be helpful. There's a site, uniteforher.org, which provides resources for patients diagnosed with breast or ovarian cancer within the last 18 months. But they have some resources that are available to everyone, such as cooking classes by dieticians online that emphasize a shift to plant-based eating. You could check it out.