Are vaccines making Covid stronger?

Not a doctor...but, just thinking out loud here.

If virus/bacteria mutate for survival reasons, they generally become (mutate) weaker so as not to kill its host and die along with the host.

If, like antibacterial soap and antibiotics making more resistant strains due to mutations to overcome vaccine and survive. Is it possible people who are vaccinated and contract Covid 19, are unwittingly making the virus stronger as it mutates to overcome the vaccination to survive? And is that why they are saying future vaccinations will be needed?

Would it just be better to never vaccinate and allow it to mutate to a weaker version than to continuously help it mutate to a stronger version?

Again, not a doctor, just spit-balling here.