You’re correct in that the initial virus was roughly 3 as you say, Alpha strain roughly 4-5 and Delta 5-8.
The difference between 5 vs 6 is irrelevant because in both scenarios, everyone will still eventually be infected, which isn’t necessarily the worst thing if we can manage severe outcomes (hospitalisations/deaths) via treatment protocols.
Like other viruses, if the above pattern continues then over time it will become more transmissible but less deadly. Circling back to why I agree with the likes of Villalad, based on the above it isn’t going away and we must learn to live with this. Freaking out over cases and shutting down is an outdated approach.