Generally, I seek advice, and I don’t give. But here I think I should.
Don’t feel negative. 20 %down is mainly because of bad timing. Need not be bad stock selection. And timing is seldom good everytime. You can excuse your self.
50 stocks is huge. You can have anywhere between 15 to 25. Now is best time to rebalance and should do it quickly.
Last but not the least, you can post your portfolio, take expert guidance and do it here itself. I might go overboard, but VP is possibly the best investment advisor available free of cost
Sun pharma is interesting case, worth looking into, if I am correct it’s near 5 year low. Its the biggest pharma company in India. Dilip Sanghvi was once richest Indian as well.