How do I plan the rest of my expenditure to offset my high rent?

Edit- unable to edit title, but I need advice on how to plan the rest of my income to maximise savings/ investment.

I(26F) recently started a new job and my in hand would be 1L~ per month. I'm going to be staying in a 3bhk apartment with female flatmates. And my rent for one room would be 20k. I took it because this was the one place that checked all boxes for me. But now after some conversations with my coworkers, I feel I'm going through lifestyle inflation because they're not paying more than 10-15k on rent. They have rented in cheaper areas of the city. They're definitely being more frugal than I am.

So I'm looking to save my expenses on other things as much as I can. My other household expenses would be 1k(maid, wifi). How do I plan the rest of my expenditure so that I can maximise my savings/investments? I'm predicting other miscellaneous expenditure to be about 5-10k. So I have 70k left over to save/invest. How do I split this amount?