I don't believe there's a method to hugely grow the bitcoin you have in your wallet without taking some risks and investing in other assets. Gambling, for example, is too risky and not a reliable approach. Trading might be a better option but it also comes with its own set of risks.

In my opinion, the best strategy is to hold onto your bitcoin for a long-term period and wait for its price to increase a lot. This is what holders do and it's  like having a passive income and it's the easiest way to profit from your bitcoin. I mean here you won't get more bitcoin, the value of your existing bitcoin will rise. Eventually, you can exchange it for a stable coin like USDT and when the price of bitcoin falls again you can buy more bitcoin. I've personally tried this and it has proven to be very effective.