Hello Shawtay!
I tried my self and the max creatures you can add to your bestiary tracker are 50 entries. This also is the same limit for both premium and free accounts. After that you will not have the option available to add more creatures, as the picture below shows:
Question Revival VI contestMarch 16, 2025
Looking for new TibiaQA staff membersJuly 12, 2024
Interview with Solkrin - lead of the Customer Support team at CipSoftDecember 20, 2023