Solved thanks to obarun:
11/19/2021 | 1:52:01 AM obarun: sunmountain, you can configure the number of tty to start at boot@ service. Run the e.g. 66-env boot@ system command and change TTY=5. Than run 66-enable -t boot -F boot@ system to apply your changes. You will get 5 tty running at next boot time.
I ran:
sudo 66-env boot@ system
Result:
66-env: info: /etc/66/conf/boot@ system/2.4.1->boot@ system->/etc/66/conf/boot@ system/2.4.1/boot@ system
66-env: fatal: EDITOR is not set at the environment variable -- please use the -e option to specify the editor to use e.g. 66-env -e nano <service>.
Ran:
sudo 66-env -e nano boot@ system
In nano, changed line 41 (TTY=!<number>):
# # Set the number of tty(s) to start.
# # 0 means no tty. Maximum is 11.
TTY=!8
Then:
66-enable -t boot -F boot@ system
Thanks to obarun, upon rebooting 8 tty's are active.