ICO is never a lot. Now there is plenty to choose from. Another thing is that there are so many ICOs that scammers conduct. That's really bad.
There should be a limit on the numbers, because the available investment is limited. So if there are too many ICOs, then the chances are that success rate will go down for all of them. Scamming is another topic altogether. We need to be always careful about scam ICOs.
Success rate doesnt always plummet with numbers. It plummets because of lousy projects with no real world application of products,thus no maker. Or just plainly, no product at all!
Had all these ICOs built upon concrete saleable product, them no matter the number, most will be successful!
Anywau to answer OP, most successful projects and coins are founded by personalities..you follow them, they have new projects and even co-managed ones. Join them