We don't know what Alpine doing for next year. They are cocking story from 2017 stating that "they are working on 2021 rule". We never know what the Dish would be in 2022 till test. If the dish is not good, Alonso will not eat it and will go for full time Indy I believe.
Mercedes did some thing in ICE to make robust, Ferrari brought new engine to testing it for this year, Honda already having good reliability(Thanks to Meclaren), Alpine? nothing.
You cannot come to race with new engine and win it straight away. one thing we never know "What Alpine aka Renault" presented to Alonso to sign the deal. Is Alonso satisfied with Alpine's plan and progress to 2022? only Alpine and Alonso knows about it.
As a Fan I am hoping Alonso get a decent Car to challenge WDC in 2022.