In redux-persist v6, you try changing as follows:

Old config V5 =>

import storage from 'redux-persist/lib/storage';
const persistConfig = {
   //...
   storage,
}

New config v6 =>

First add: yarn add @react-native-async-storage/async-storage

import AsyncStorage from '@react-native-async-storage/async-storage';
const persistConfig = {
  //...
  storage: AsyncStorage,
}