Re: You may lose hope in other cryptocurrencies but not in bitcoin.
Contrary to what many people believe, Bitcoin is actually not the first ever Crypto-currency, rather it best to say Bitcoin is the first well known Crypto-currency.
Bitcoin is not a first cryptocurrency but it's a first decentralized and successful one.Bitcoin prehistory.
Before Bitcoin, there are some cryptocurrencies: DigiCash, CyberCash, E-gold, HashCat, Bit-Gold, B-money, and Bittorent.
When you sell your Bitcoin, does it mean you don't believe in Bitcoin? 
People sold their Bitcoin because of many reasons. Some people sold their Bitcoin because they need money urgently, other sold Bitcoin because they want to secure profits and buy again in the next correction, and there are also people who sold some Bitcoin because they want to diversify to another asset.
Selling is an activity to get money in cash or stable coin from your bitcoin. The market needs to have both buyers and sellers so what will happen with market if there are only buyers and no sellers?People sold their Bitcoin because of many reasons. Some people sold their Bitcoin because they need money urgently, other sold Bitcoin because they want to secure profits and buy again in the next correction, and there are also people who sold some Bitcoin because they want to diversify to another asset.
It's funny to write this, because if there are seller, buyers can not buy bitcoin and there are no buyer too. Don't feel bad when there are sellers in the market, and they are contributing to the market by selling bitcoin at prices they see good.