Tello... if you are truly wondering about the issue of immunity...
... If you've had the original strain of the virus, or the Alpha variant, the evidence suggests that you are not immune to the Delta variant.
Both the Pfizer and the AstraZeneca vaccine give a good level of protection even against the Delta variant. As far as I'm aware, the Moderna is as effective as the Pfizer against this variant.
They're not a perfect protection, but they certainly give a much greater level of protection than relying upon antibodies of a previous infection. (That is, where the previous infection was not the Delta variant.)
Future vaccines will be tweaked to improve protection against the current and emerging variants of concern. That will no doubt be ongoing.