Holding will never increase the Bitcoins you have, bitcoin will remain the same as much you had bough.

Way to grow your Bitcoins depends on the skills you have:

• if you are good at reading the market then trading is the best thing for you.
• if you are a writer then you can write content for projects and earn in Bitcoin
• if you are businessmen then you can sell your product or service for Bitcoin
• Employee in any company then probably you can code and ask part of your salary in BTC