If you are asking solid altcoins NOT be in the top 100? You are actually looking for nothing...
You can never find among them if that is your criteria as these solid altcoins are not on the bottom but they are on top. Maybe if you are certainly looking for shitcoins, there is was the best spot to search.

I'm no intent to discourage you but that is the reality. If you wanted to make assurance at least, better look at those coins that are on the top 100. This will save you actually and value your money as they are worth investing.