At present the number of cryptocurrencies is more than 22k, if we pay attention to Coinmarketcap every day appears at least 10 new listed coins, this makes us many choices but from the many bitter experiences make us better focus on coins who have a strong reputation, of course we are impossible Just relying on Bitcoin, some Altcoins have a good reputation.
Why it's possible to just rely on Bitcoin while you're said bitter experience make you choose coin with has strong reputation? you're contradicts yourself.
Some altcoins are good, can you show me which is good altcoins it is? if you mention the coins that listed on the top 10 or 20 on coinmarketcap, you're dumb. Those coins are only listed by the market cap only, not from the utility, trustworthy, decentralization, real case etc.
Someone can just create shitcoins and ask help for few whales to invest in big amount money to overtake Ethereum position.