Hi @Juan Baires , welcome to Microsoft Q&A forum.
The current fixed limit on number of container varies based on capacity mode we select. Serverless allows us to create 100 containers while provisioned throughput allows 500 container. Below is the screenshot for the same. I am assuming you must have created serverless account.
Azure Cosmos DB service quotas
We can migrate this account to Provisioned throughput account and we will have an enhanced limit of 500 containers per account.
Tutorial: Use Data migration tool to migrate your data to Azure Cosmos DB
Azure Cosmos DB allows us to increase the quota for some of the types but we dont have anything specific for increasing number of containers.
Please let us know if you have any queries on the same.