How can I use Thunderbolt to do Migration Assistant?

I am trying to transfer data from the 2013 iMac to the new 2019 iMac, but I have a Thunderbolt 3 to Thunderbolt 2 and then a Thunderbolt 2 adapter in my house. How can I use it to setup migration assistant because when using migration assistant (peer to peer), it would not transfer software like Chrome, or Xcode, or Firefox. When attempting to do time machine backup, it is too slow that after a day, it instead of downloading, it failed. I couldn't even erase the drive, until my MacBook Pro 2019 (my primary mac), does the job. My last resort would be to do the plug in with thunderbolt 3 and thunderbolt 2, but I don't even know how to connect it so that migration assistant would work with Thunderbolt instead of using the peer to peer.