First things first, always try some of the top 10 high cappers. They may relatively costly but they are more reliable and less volatile as you go down the pecking order in coinmarketcap. Then try some of the meme coins. I know it sounds dumb, but if you check out the top gainers everyday on cmc you would notice about 50% are memes. So it wouldn't hurt to put $100 on some of them that are exciting