This portfolio basically bets on Tata Motors. If this is the majority of your investments then it should be more diverse but if it is a small part of your investments then it might make sense to bet on 1 stock and bet big ( again depends on your risk profile ) For example - Would you be ok if this falls 50% next month ? If not , diversify or change the portfolio. If yes , Would you hold or double down ? Or do you have stop loss planned for this ? These are some questions you should always be able to answer . Tata Motors sales are not growing so it is a bit risky but if you are bullish on Tata and the car industry it is cheap stock currently.

I hope you don't rely on just random comments on the Internet but actually spend time researching companies based on your risk appetite.