It is good time for investment as in a day itself it has jumped 600$+ and if had done investment yesterday also would have easily made money of 600$ per btc . So before it rises further buy now and keep investing in good altcoins or in btc .
I think at this moment, it's altcoins is the best investment as it could easily double the value if BTC will pump even half of its current price now.
Bitcoin currently at $12,000 so half increase would make the price at $18000 and I think that's where the real FOMO will start and altcoins will start to dominate the top gainers in the market.
That's how I see it if bitcoin's price is nearing to its ATH, and I hope I'm right.