Congratulations on your power down.
As for the next big altcoin, I've never looked for it. Not once. I don't analyze them because, as you said, 99 percent of them are shitcoins. It's like looking for a needle in the haystack. I suspect the next bull run is going to shake the market and you'll half the top 10 drop out of the race. Checking the history of the ups and downs of the top 10 by market cap is rather eye-opening.