First of all, you need to join some subreddits and threads on Quora that are related to your niche and to what you have been doing. Then, try to publish there regularly and make sure that your posts are valuable and that really have some kind of contribution to the community. Also, you need to be very active if you want to attract more traffic and audience to your profile which means that you'll need to engage with the content of others, comment on their posts, post some links, etc. On Reddit, you can also join some groups, share content from others frequently, connect directly with some users, and so on.how i can get free traffic from quora and Reddit