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Because literally in banking system for example, if you have $5000 that will be the value in 3 to 5 months and will add a little interest in it so my question is- I don't fully know how bitcoin works. Is it the same way with the banking system? Will I get more value or less value in future times?
Is it not that a risk that if you convert your whole savings in BTC, there is a chance that your investment may reduce in value? Remember that BTC is volatile- if you can handle its volatility and accept the fact that your initial investment might decrease, then go for it. But having no physical cash on hand, despite the problems the bank is facing, can be problematic especially when an emergency arises.
Personally, I would convert at least half of my bank savings as BTC and save the other half as cash. In this way, you get the best of both worlds of investing and at the same time, having cash on hand in case of an emergency.