You can continue what you currently do by investing in bitcoin using DCA to save your money in bitcoin regularly.
I suggest you move the bitcoins to another separate wallet and don't combine them with your father's bitcoins.
Having bitcoins means you are responsible for those bitcoins so you must know how to store bitcoins properly.
You are young but want to learn how to invest in bitcoin so that if you can continue investing in bitcoin, you can earn good returns in the future.