To you the current market situation seems like a normal situation to invest but honestly to me every situation in Bitcoin seems good enough to invest. But we can't predict from which stage the Bitcoin market will go. Just as Bitcoin can move from lows to lows, Bitcoin prices can go from highs to highs. We cannot say anything about the Bitcoin market in advance but by researching the market and observing the market regularly, one can predict the market movement to some extent.
Investing in Bitcoin and holding it deep is a very challenging thing for every investor but those who accept this challenge and hold their investment deep achieve success.
it's funny that some persons will wait for moments when they see bitcoin price going up before the thought to invest in bitcoin comes to there mind and like you rightly pointed out, bitcoin price can go up and then up, up and then down, down and then down and so on. so you can't just predict that because it is going up now , this is absolutely the time to invest into bitcoin and when you see the price going down you retreat from your plan on making the investment. It means that if you even successfully make the investment, you can't hodl your bitcoin because in the event of any fluctuation in price, you will let go of your investment.
Real investors sees the prospect of bitcoin and invest a certain amount and leave it for quality amount of time while he monitor the price without getting seriously moved by any fluctuations in price that comes along the way.