Probably now is the time to buy, what you have long planned. Since it seems that the market is starting to wake up, a lot of good news appears.
Depends on what the TS plans to buy altcoins for. If he is fixed on the high BTC out in the USDT it makes sense to buy BTC again and part of the deposit to spend on altcoins/tokens. And if the purchase will be made for FIAT you can start immediately with altcoins.
Although: Buy always BTC!