Keeping all money or assets in one place or one type is stupid, let alone saving all money in bitcoin in the hope that prices will continue to rise, as investors and we have known bitcoin for more than 2 years, of course we understand the risks, I have also experienced losing more money from 50% within 6 months because the price continues to decrease, since then I only make bitcoin as an additional investment with a small portion.
Your experience with Bitcoin may not be pleasant, but that doesn't mean you should consider Bitcoin a bad investment because Bitcoin is still much better than other cryptocurrencies. You are not at all wrong if you want to make other cryptocurrencies your big investment, but you may be doing a little mistake by putting less money in Bitcoin that you should be putting more in Bitcoin and less in other cryptocurrencies.
Because other cryptocurrencies can also experience a more severe decline when Bitcoin starts to lower its price in the market and you won't get profits easily if Bitcoin price conditions are not improving. So try to think again before you put your money in another cryptocurrency.
It depends on what asset he invests in, if he only invests in a pump and dump project its better to keep all the funds in Bitcoin, losing money 50% in a few months is normal in crypto just don't lose from any scam attempt such phishing, fake project, etc. and also don't afraid when Bitcoin losing 50% in few months since not only Bitcoin that drop that much but stock can happen too.
I think what you say is more appropriate for @Ngewex Yuk to understand, because he still thinks that other cryptocurrencies can be better when Bitcoin is declining. Even though from experience in the past it was also very clear that other cryptocurrencies also experienced a simultaneous price drop when Bitcoin did not get a better price increase in the market.
And for a duration of six months it is a very short duration for investors who have been in the crypto space for a long time so it is also very natural that it should be said to be normal, because price recovery in Bitcoin after a decline has also always existed in the market which it is always proven on Bitcoin.