A lot of communities already do this @neoxian is a big one for promoting engagement and they have giveaways.
Giveaways are good but the real value of a token comes from scarcity and a use case. As you can earn tokens from posting scarcity is hard to achieve. This is where use ( a place to spend the token) comes in. As the community using the token spends it to gain items they have to buy more and this can increase the value of the token. I mentioned this as a lot of communities on steem are built around tokens.
If you want to see more people onboarding to steem help whatever community you are apart of have fun. Enjoyment will also lead to stronger communities.
Engagement without enjoyment is just not going to work.
Have an awesome day @mcshayn!

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