Freelance Income from Abroad: Pay Tax or Just Hope No One Notices?

I earn between 50k INR and 100k INR every month from overseas freelance work for international clients. I invest most of this money in mutual funds. My questions are: 1. Do I need to pay tax on this income? 2. Do I need to file an ITR (Income Tax Return)? 3. What are the consequences of not doing either? 4. Are there ways to legally reduce the tax I need to pay? I’m new to this, so I apologize for any confusion or lack of knowledge.