I think that only 100 tokens from those 13000 are worth attention that is why I am used to looking for coins to invest on coinmarketcap in a top-100 table. I choose one that is on lows or at least not on highs and investigate details about it such as what project stays under it, who are partners and developers. Usually, I also try to sort out the whitepaper and read a smart-contract.
Not to let your hopes up nor discourage you on this, though it isn't a bad thing but there are startups that aren't yet on the top 100 and top 100 changes from time to time. If it's worthy of attention I think it's the top 10 or 20 and not the 100. CoinMarketcap is a reliable source but there are coins that has good use cases that are still on the top 500 or even up and it will take time before they get noticed and one day may replace that top 100.
Look at EOS position right now as far as I can remember it was used to be at the top 10-20 around the 2017 or 2018 ATH but look where it was positioned now, it's sitting on the top 42 as I've written this reply. Just an example was the likes of NEO, DASH, ZCASH, and LTC to name a few.