The safest way of keeping cryptocurrencies is cold storage, it's safe because it's offline. To me storing any data, password etc. online is very risky, especially nowadays, when 'Internet crimes' are very common. There are more and more people who are the victims of theft on the Internet. It's much easier to recover stolen money than reclaim cryptocurrencies... There are some companies which offer help in such cases, the thing is to distinguish it from a scam. I always look for partners, cooperations and background of a platform I use or I am interested about, like in case of Coinfirm, which can reclaim stolen Bitcoin ot Ethereum and are partners with e.g Binance or Bank PKO. Be careful for scams which want to fight with other scams