So In conclusion, I respectfully ask "what is your Effective Expert Advise for a Person (me) that has enough Salary but still want more Financial Stability using cryptocurrency".
If you already have a stable and more than sufficient income then you can enjoy what you get and don't need to look for anything else. However, if you want passive income then you can start by investing. If you have a lot of money, then the investments you make will have lower risk than someone who has little money. The concept of Bitcoin investment is actually simple, we just need to hold it until the target price we want is reached. If you have a lot of money then you don't need to rush to sell your bitcoins because of a sudden need, if you can do this then investing in bitcoins is a very good way for you to aim for financial freedom in the future.
Seeking for more is not a bad thing however, seeking for financial stability from an investment is. Investments can generate profit but will not always result to financial stability unless it generates consistent profit such as with normal businesses. But with cryptocurrencies with volatile market prices, you may only earn profit thru right market analysis. Even experienced ones in this industry are still experiencing loss which should be enough to manage our expectations. The amount of profit as well would depend on the amount of money you will invest which is also a factor. Based on the present, this idea is unrealistic but is valid at some point.