If we look at Altcoin, they do not give us the profit and growth and good exchange that we get in the world of Bitcoin and you are also saying the same because this is the one coin that has done the most advance work compared to other coins. Due to which it is considered the best and most successful coin. Whoever has money to invest in Bitcoin will also collect money for the exchange without saying anything because he will have done good and best work in Bitcoin. It is really expensive but it is easy for those who have it because they have acquired it for a long time and so far they are in profit.
If you don't care anything about blockchain security, transaction security and only care about profit, Bitcoin is still your best choice.
All cryptocurrencies have bull and bear markets but Bitcoin is unique as after each market cycle with bull and bear months, it will make new higher bottoms and new higher ATHs. Altcoins are different and opposite with Bitcoin, as many altcoins make lower lows, deeper bottoms and end with deaths.
With Bitcoin, you don't have to worry about accuracy of your entry price because with its strong survivalability in this market, if you can hold your bitcoin even you bought at ATH of a previous market cycle, you can still exit with a draw or profit in a next market cycle. You can not have it with most of altcoins and even lose all money when an altcoin project dies.
https://charts.bitbo.io/yearly-candles/