Alot if them are fake. The percentage is 5 and 95. The good altcoin or shitcoin taht yeild profit is just %5 while the bad once is %95 so you can hardly predict the altcoin with potential that would yield you profit. You sound like you gamble alot with your fund on altcoins. May be you are pretty lucky not to buy and emidiately dump. Maybe if you may have loose alot of fund your story would have been vise versa.
The percentage of altcoins success is small but when it increases in price then its success is more than all other coins as when higher is the risk so the profits will also be elevated. Everything has certain limitations therefore we should remember that we have to overcome risk such as we are choosing coins so it is our responsibility to not choose any altcoins the marketcap of which is lower and which has no previous signs of success.
Among altcoins a better and most successful coin exists like that of Ethereum so we should not be worried about our future and also there are some other altcoins means Solana, ADA, and BONK are those coins the selection of which is not consider as a gambling. If you don't have knowledge and don't know real details then not matter how strong your selected coin is you will be involved in gambling because here you are not using your learning abilities but you are inspecting your fatality.