I have been working on my vacation many months before and I do not want to see many people. Initially, I thought of visiting it during the monsoon season (May to September) but I am not certain since the rain might be an issue. I also considered shoulder season (April-May or September-November) but the weather is unpredictable and I do not want to be caught in a storm. The weather is better during the peak season (December to March), however, it is highly congested. I am now considering going either in October or November when the weather is still warm and the crowds are less. I have heard that Andaman group tour packages (https://andamantourtravelpackage.com/andaman-group-packages/) may be useful because they usually have their guide who is aware of how to avoid congested places. A boat tour also appears to be one of the most appropriate methods to explore it, as it may take me to the far away spots with an incredible wildlife. I would also consider staying in a hotel outside of the main town and have a more intimate and less touristy experience.