EVE-NG is the emulator for multiple vendors to make the network architecture and built the labs. It can be available from the official website.
I have started using eve-ng since I started my career in networking. It is much more advanced than what we can not achieve with the packet tracer.
It’s a great tool to practice and understand the fundamentals & implement right in the lab there is no need to wait to go to a workplace ( Ya! don’t try on production devices) or even purchase your own equipment for learning.