Signal is to privacy what duct tape is to a broken item - it solves your issues and concerns, but you shouldn't expect it to last. Instead, consider Matrix.
I don’t know if Matrix is the solution for everything. There’s xmpp, on the side of decentralized+federated options, which seems to me better in terms of meta data leaking, and for self hosting, less resource intensive. And on the side of distributed p2p mechanisms, there’s Jami, Briar and others, which should be even better for privacy. The important thing is to make people realize centralized, and not so FOSS solutions (not sharing the actual code being at use, doesn’t seem really open source, for example), plus having to trust the service provider, is not private neither secure…
I don’t know if Matrix is the solution for everything. There’s xmpp, on the side of decentralized+federated options, which seems to me better in terms of meta data leaking, and for self hosting, less resource intensive. And on the side of distributed p2p mechanisms, there’s Jami, Briar and others, which should be even better for privacy. The important thing is to make people realize centralized, and not so FOSS solutions (not sharing the actual code being at use, doesn’t seem really open source, for example), plus having to trust the service provider, is not private neither secure…