You will have to guess between from today to 25th of January 2025, entry close by 12pm GMT, and winner will be announced 2-4 days interval.
Do not mind me. There is something I do not yet understand about this contest which I will want you to clarify. Assuming people start selecting what you requested, when will the selection ends? I think the time should be very short in a way it should not be more than 7 days. Just like I have implied, I may just be confused and not really understood that you have mentioned it in the OP. With how I understood the OP, people are given up to 24th of January to select.
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You still don't get what he's trying to say,
Now from your rule you mentioned it that contested have the chance to guess right from now till 25th of January.. right??
Hence, you added : quoted..
"You can only pick minimum of 3 persons from the list above, and guess what their merits will end before 24th of January"
This means that if you give everybody the chance to guess tight from now till 25th then everybody will probably just wait to drop their entries on 24 then screenshot on 24 and send it on 25 easy pizzy

Here is what you can do imo ...
Break it into two aspect (from what you stated), the guessing which should run for maybe 1-2 weeks, then the screenshot can come in on 25th , this is not necessary though a good suggestion would be just taking the guess only, creating a open data entry list just like a raffle since it can't be changed once guessing, now you can make your selection on 24th January after checking each of their merits count compared to contestant guess to pick a winner ..
Sug: it's not easy to get accurate result why not just set nearest guess plus you need to consider more winner than just one but if you feel that's what you want to use then it's your rule
