I think you have forgotten about FTX. Any of these giants can go out not excluding Ethereum.
A centralized exchange still remains one no matter how big or how long they have stayed.
That's right anything can happen, even Binance can go out like FTX! But there are numbers, signs, or analysis that shows us, things like this can't happen, so speaking of FTX what happened their, in short they did not managed things properly, speaking of Houbi, they did not filed for bankruptcy but many users left using them, because they suck at their a lot of things, their main site was hacked and scam links were placed there, the books of there was not right too, people found that out early and left it. People with the past events have became more alert and focus on analysis more, things like this can't occur with ETH, SOl, or even BNB that I know. Even wit mantra, many saw it coming before if you study that part.
Rather than buying another coin just add another market to your portfolio
Try a Good stock or get some shares in Real Estates Getting gold and other precious metal is an option.
Cryptocurrency isn't the only investment that exists out there, many form existed before it came to fruition.
That's a very good advice really, if we have enough money and resources that we can start in another market, I think we should go in real estate. I regret that I did not go in the real estate in the last year, I had enough money which i lost in crypto trading, if I would have went into real estate that year, I might be in lot of profit but I was dumb, now I find many good deal in real estate but don't have money.