I think if you see the cheap price of every altcoin then you should buy first so if in the next week the price is jump, you already have some amount to sell so you can make your profit. don't be too late to buy the coins and don't buy the coins when the price is start to increase because sometimes the price is not increase too much and only test before the price increase later.
That's true, make sure you won't regret when the price of bitcoin increase drastically then, actually there's no harm to buy at the current price considering it has reached around $20k , people might expect to experience that ath again. We just don't know exactly when. But it would.