The hardest part of getting feedback is asking for it. So don't ask a stranger, get matched with one: one other quiet person, introduced personally, to trade honest notes on each other's writing, swap endorsements where you vouch for each other's work, or just compare notes on being bad at announcing. No group to keep up with, no community obligations. One person, matched by a real human.
You leave your name, email, and a line about what you make. Sabiha Afrin matches you personally with one other person whose work and temperament fit, and introduces you by email. No algorithm, no group chat.
Whatever you agree on: trade honest notes on each other's drafts, swap endorsements where you vouch for each other's work, or just have coffee with someone who gets it.