Do you think cardano will over take ethereum in terms of tech with voltaire being worked on this year. Along with erc20 converter for easy conversion to cardano via ethereum.

I think that this topic already outdated. You were just repeating it once there are bunch of threads that already discussed about this before. I think that it's better if you are spending a few minutes in your life to dig the old thread. There's no reason for a to take b position.
Think about whether investing in ethereum or cardano can change your life or not.