Read the studies you linked. HCQ and Ivermectin probably work as effective remedies to lessen the symptoms of COVID-19. But they are far from a silver bullet. Even if they were being used widespread in all COVID cases, the most optimistic studies show that it would have only had a 10-20% change in how many people died. Maybe.
The best remedy is still prevention. Get vaccinated if you haven’t had a positive COVID test in the last few months. If you can’t or won’t vaccinate, avoid contact with people and wear a mask when leaving your house.