What we suggest is you can promote your twitter to your friends & business partners to get more retweet on it.
I understand what you are pertaining, But I pointing out those crypto influencers, They tons of followers and anything they post will surely give a huge amount of retweets which is a great disadvantage for a normal twitter user. What I want to suggest is to have distributed criteria for choosing a winner, Eg. 50% for content quality, 40% for amount of retweets receive and so on. I will not participate if the criteria will not change since my chance of winning is 0% in my current twitter stats.
For the booth space, we would like to let you promote your concept / idea / startup in the Malta AI & Blockchain Conference, so we bundle it as a prize with travelling subsidy and encourage you to go to the conference for meeting new people and opportunities, and we will cover your air tickets.
Fair enough, I didn't consider this since I don't any idea to promote out there, Anyway, it's good to meet new people on crypto space and also free travel is not that bad. Good luck with running this contest.