Whether you get yourself jabbed with a booster now, wait for a possibly better vaccine to be developed or say to hell with it altogether is up to you. I have no expertise in any of the relevant scientific fields but I am less inclined than you to dismiss out-of-hand the guidance of people who do have such knowledge.
Beyond that, I am [perhaps naively] confident that the government of Ecuador will continue to make vaccines available to the people of this country. So far, that has been the case and they have vaccinated me for free even though I am not a citizen but, rather, a resident alien.
Covid is on the upswing again here, as it is around the world. I don't know which variants are currently most prevalent in Ecuador but, for my own protection and the protection of those around me, I think it is my responsibility to keep myself maximally vaccinated. Should an improved vaccine become available here in the future, I will get myself shot again.