2. Friends told me that Vitalik have promised Proof of Stake on Ethereum for years and it never came to past, I believe them and invested in Eth mining equipment, I am now selling to gamers since they are not profitable, not even a bit.
at least you didn't lose it all, you still can get back your money when selling the equipment because I see on social media if gpu is used mining then it is difficult to sell, especially if you tell it
from all experiences it happens because of listening to people's advice without doing any more research so that you end up at a loss.
My exorbitant experience in the bull market did not sell the 1 altcoin that I had after the price rose by thousands of percent because it focused on something else that turned out not to give any results, so on the bull market it is better to focus on what you already have and convert it to btc or fiat if it is already really profitable than looking for other opportunities that are very likely you have missed the train.
By the time ethereum completed the merger moved completely to POS, mining equipment at that time was very cheap, I remember I saw somewhere an online store selling GPUs for very cheap prices, even losing more than 90% of the original price. It can be said that it is really a big loss for those who bought mining equipment recently but forgot to update the news.
About altcoins, this doesn't just happen to you. The market participants before 2017, I think they were all in the same situation, I also didn't sell any shitcoins at that time because I think they will last long and give bigger profits if held long term. It's an expensive lesson about altcoins so experienced people would never advise investing in altcoins, bitcoin is the best choice.