You should sell and take your losses because you don't yet know what you are doing.
Imagine that you were twelve years old and the family was not home. You borrowed the car keys, took the other car, and decided to try your hand at driving before your parents got home and anybody noticed. In addition to driving over your mother's flowers, something you planned on explaining away, and a small dent in a neighbors car that you were going to know nothing about, you careened out of control in an intersection. Fortunately, nobody was badly injured but the car was totaled. You ask the policeman, "what should I do next?"
The answer will be to wait until you are ready and learn how to do things. Coinbase is radically overvalued at this price.
Before you react to the news, ever again, I want you to remember a couple of things.
First, in 1938 Orson Welles produced and starred in a radio play. At the beginning of the play, they announced that it was a radio play in preparation for Halloween the following day. Because people turned it on late, they missed the announcement. Millions of Americans believed that the United States, New Jersey, in particular, was invaded by Martians. Some people committed suicide. People packed their belongings and fled their homes. Police and military phone lines were flooded with calls.
It does not have to be realistic or believable for it to make sense. People believe Trump's election was stolen, but it is easy to check that it was not. It is silly easy to check but the emotional threat involved in checking is so high, they don't want to question it because it would mean that they were made fools of.
Second, people hate disconfirming information. They hate it so much, they often cannot find it. Several central banks are considering offering national cryptocurrencies that can be exchanged without fees for cash money. That would destroy Coinbase, instantly. What is it worth?
Third, when people act in groups, the good common sense that any one of them would use at any other time goes out the door. Groups cannot be rational because they do not share preferences. Because of this, they have to violate the "law of the excluded middle," and in doing so make incoherent decisions. A mania is the result of a spontaneous group forming.
So what should you do?
Pick up a copy of "The Intelligent Investor," by Benjamin Graham. It was last published in 1972 and is still a best seller, which is why it is still in print. He died in 1973.
Then, if you have no accounting background, get any first year accounting textbook or managerial accounting textbook for non-accountants. You have to know how to value things and to do that you have to know how to read a financial statement.
You will need the skills of addition, subtraction, multiplication and division. If you have those skills, you can excel at investing.
Once you have read that, get a copy of the 1943 version of Security Analysis by Benjamin Graham. Yes, it is still in publication. It was recently updated by the leaders in the industry to have appendices at the end of each chapter to update it because eighty years have gone by.
IF you would like a little more support, there is a 1987 version of Security Analysis by Cottle. It is easier for those without strong accounting backgrounds.
Unfortunately, all of this is very boring but you will get rich.