From a personal perspective, consider taking profits selectively, prioritizing essential needs like medical emergencies or contributions to your favorite charity, if that aligns with your values..
Beside this, stick to the advice above, hold your bitcoin and take profit on your shitcoin. It would be illogical to take profit on bitcoin and then converting the best money the world has ever seen into a weak fiat that you then need to immediately pay taxes on. Understand that bitcoin is hardest currency ever created.
If you want to follow the advice of your teacher, an alternative way to do it, is to take profit on your eth, xrp , cardano, stocks, Euros, Yen or Canadian dollars or US dollars and strategically invest it in bitcoin.