If any one has diversified before this correction it would have been a good strategy. Before last 3 weeks we have only seen price rise in BTC from $7-8K to $17-18K. But Altcoin were almost unmoved. But in these 3 weeks we have seen a lot of action in the ALTCOIN. Some of them have even double or triple in value. I also follow the same strategy as and when i get some profit i book 10% of it and invest in other coins.