Planet Earth, Mars, and the Rotation Rate of the Sun

If venus was had a different atmospheric composition or a different mass, would it be? It could be as habitable as earth. And even same with mars, if it had e a thicker atmosphere and but a lot more mass. Like there could have been three completely habitable worlds in the solar system, just fine tuned there. They'r chemicals a little bit. Yes. Mars, you'd have to ke change its mass to allow it. No, no, the same mass as earth. There's all of these what ifs until we're able to start consistently finding and studying smaller worlds around sun, like stars were,. That habitable is further out, and you're not getting titly