a mistake, you only use one wallet for all the coins you have. you should be more careful because the wallet is easily hacked and you will lose. My advice is to use a different wallet for all your coins, and be careful when opening using a private key. do not open via smartphone or by using wifi.
If you have one wallet it does not mean you are safe of putting your coin but it is in need to haveore wallet so that it would not easy to hacked. That is a cool idea of putting and saving the money but it always depends on the situation if you are still and keep holding the money for long kot one shot.