I know it’s basically impossible to make them delete the data they already have on me, I really just want to stop using their service

My friends and I all use Facebook’s messenger as our group chat and Discord for voice calls while gaming. That group chat is literally the only reason why I haven’t deleted my Facebook account yet. I have a Matrix space ready and have convinced a couple of people to make accounts and join the space, but it is just not being used at all. I was actually hoping someone was going to need to provide an ID to log into their discord account as that would most likely be the final push that moved everyone from messenger and discord over to Matrix, but so far it hasn’t happened and the Matrix space sits vacant