Firstly, welcome to Bitcoin world. Generally there is not a bad time to buy Bitcoin. As a long term investment, you can always make profit. Also, learning about this technology will give you great advantage in the next 30 years which i think is the best part of it. I would recommend you to read more before buying any coins. At this moment, ethereum can be a better investment.
for me dont look to bitocoin only there is some coin that are better in terms of investment even we all know that bitcoin is good and better in long term why dont try another than of this, just like what you are told ethereum too is a good investment that can give you a profit.