What is best way?

Of Couse, If you are proper active in a niche forum which allows do follow backlinks of high-quality traffic that turns into conversions. The Do-follow backlinks are kind of permanent backlinks. They are considered as link juice. They help you in more search appearance on many keywords.
Yes, it is possible. You should find a do follow list first. Then try to register there. Make your account legit doing few normal posts. And then leave a link back to your website.
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