The price of the BOB currency rises at night and falls in the morning. Should I sell when it rises and buy when it falls? Or should I wait and neither sell nor buy with me 450 million.

How to buy Bob coin
Enter the Binance platform, and you will find the word 'alpha' written on the homepage.
Enter it, find the coin, click on the coin, and trade to go to the purchase page.
Click on the limit option, not the instant one, and make a purchase with a limit order, and after a few seconds, the coin will be in your wallet.
There are many very cheap different coins.
May God grant everyone success.