most of cryptocurrency are red for now and down in USD terms,, especially bitcoin
at this moment bitcoin price down below 10K USD depends on coinmarketcap data
is this the best time to buy more bitcoin ?
I think that's right now, but it's up to your own decision. The market is inherently volatile. The downside may go up. No one can predict it accurately. If you think the price is right for you, do not hesitate. You can. Buy and hold.