Open the app that you added the sticker to (Messages, WhatsApp, Telegram, or the sticker app).
In Messages: open a conversation → tap the App Store icon or sticker button → tap and hold the sticker pack → select Remove.
In Messages: open the Messages app → tap the sticker icon → tap and hold the sticker pack → select Delete Pack or Remove.
In WhatsApp: open a chat → tap the sticker icon → tap and hold the sticker pack → select Delete or Remove.
In Telegram: open a chat → tap the sticker icon → tap the sticker pack name → tap Edit → select the stickers → tap Delete.
If you added stickers via a sticker app: open the sticker app → go to settings or manage stickers → select the pack → tap Remove/Delete.
To remove sticker packs from iOS sticker suggestions: open Settings → General → iPhone Storage → find the sticker app → delete the app to remove its sticker packs.
If you can’t find the option in the app: delete the sticker app from the Home Screen (or Settings → General → iPhone Storage → delete the app).