1. Is there a way to get the most voted list of topics
Or to get the most liked topic or popular topic it's very urgent
For the popular topic list, I'll suggest you check the Threaded Layout. The layout has an option filter buttons [newest] [popular] [solved] [unsolved], that allows you to filter the topics with the mentioned above options. You can check it here: https://wpforo.com/community/
Besides, we have a plugin customization and custom addon development services at the gVectors Team. They can assess the work and create it for you. Just contact us via sales[at]gvectors.com
email address and send a list of requirements you'd like to have.