I know many will say the time ended, we must have bought before 15 days but I think this is the best time. Before couple of weeks ago, BTC was around $4k and which is why altcoins are overpriced in term of BTC. Now that BTC has gained price, altcoins price has decreased in term of BTC and now is the best time to pick your favorite altcoin because right after the BTC ride, altcoin will also follow the trend.
I don't fully agree with you. Despite the fact that the price of the alts have dropped in BTC, it doesn't mean the prices dropped in USD that means you will still spend more physical cash technically to buy the coins.