Increasing the quota for an ECS instance in a region on Alibaba Cloud
Solution 1:
I found out that in order to do that one must have to open a Ticket with Alibaba Cloud, only then the quota can be increased.
To do that, click on the menu icon on the top right of the Alibaba Cloud Dashboard > Support > Open A Ticket.
Reference: https://www.alibabacloud.com/help/doc-detail/25412.htm?spm=a2c63.l28256.a3.60.6457745323IRoK