Thanks for the comment. This is a good question:

What do we need to do as a participation to support the strengthening of the steem exchange rate?

I don't think there's any right answer, and it could be the topic of an entire blog post, but I think it comes down to just one or more of a few basic things:

• Do things that attract people to visit the site (create interesting & informative content, recruit people, share links to other social media platforms)
• Do things that keep people here (vote, comment, and resteem articles of others so that content creators feel that their work is appreciated)
• Invest by buying Steem and/or powering up author rewards

To a large extent, I think the exchange rate is driven by external factors, but if we have any chance of influencing it, the concepts above are some of the ones I think to focus on.