I think that too xD
Tibia is a hobby closely associated with the age of the players, so it is a small segment (and well known; You will most likely see the same player on several servers)
If someone did not play Tibia between 1996 to 2021, it is unlikely that they would be interested in the game (even, would I say from 1996 to 2007 ?, because Tibia changed a lot at 8.0)
Already around 2007 there was strong competition from Shooters (like Counter Strike) or other MMORPGs (like Ragnarok/ Mu /Lineage) with better graphics and technical demands that were not very high.
If I am a person X who is walking down the street, I will see your ad, I will find it beautiful but I do not think it catches my attention (Who writes down the web pages that one sees on the street? a photo or take a pencil / paper to write it your webpage/IP?)
The best Marketing option, in my opinion, is to take advantage of social networks that have matching engines (if you search for the word Tibia, these engines are in charge of showing you all the possible advertising associated with Tibia
And do you have to think that the OTserver universe has to be about 3,000 players?
That are distributed among all the servers and move in groups between them
The idea is to monopolize the interest to prevent them from leaving your server and growing more and more;
Rather than aim for new players to arrive, you should aim to retain your old players (the new player comes and goes; the old player will stay as long as they are interested in your game)