If you love bitcoin don't ignore this thread.
A lot of people are saying that they are going to start businesses with the money so that they can earn revenue from those businesses and make money. Still, they are ignoring the fact that they will only have 3 months to start the business, set it up, scale it up, and have enough recurring customers or clients to be able to make enough revenue that will be equivalent to 3 bitcoins and I don't think that can be done in such a short time since businesses require time to scale up.
So considering this, I would probably get into a buy and resale sort of a thing where I will buy things such as cars or mobile phones or anything that I know has enough demand and I can resell them quickly, this way, I will generate revenue on each sell and if I can resell those items quickly, I can easily make enough profit on each sale and be able to make 3 bitcoins in a 3-month period.