If you want to ride different worlds it is really easy (although boring seeing not many other riders)…
- Look up Zwift calendar, remember any date that shows the world you want to ride
- Go to your PC settings - change Date and Time.
- Manually change the date to the date of the world you want to ride and save
- Open Zwift and you will be in the world you want
- Don’t forget to change the date back when you’re finished
This takes me about 2 minutes max and allows you to ride any world when you want, although there is a forum with a vote to ask for this “change world” option - go vote there