There are too many projects that will increase their value long time but since you want coins that have marketcap under 500 million dollar I would suggest some of these gems:

KCS: Kucoin Shares is in Kucoin exchange platform just like BNB to Binance exchange. It offers reducing trading fees and such. It has too much potential, it's only 405 million dollar marketcap and price is $4.70 for now.

DAO: Daomaker project's token, currently have 64 million dollar marketcap and price is $3.80. You have to hold coins to participate projects on Daomaker.

JULD: Julswap project is another platform in Binance Smart Chain. Similar platforms have taken off already such as Pancakeswap. Julswap have only 62 million dollar marketcap and price is $0.30 now.