BIllioner coin more investment or Millionaire low investment you're looking for underrated coins to add to your portfolio. Here are some potential options:

1. *XRP*: Known for its fast transaction times and low fees, XRP is a popular choice for cross-border payments.

2. *PEPE*: A meme coin with a strong community, PEPE has gained popularity in recent times.

3. *Shiba Inu (SHIB)*: Another meme coin with a dedicated following, SHIB has shown volatility and potential for growth.

When building a strong portfolio, consider factors like:

1. *Diversification*: Spread your investments across different asset classes and sectors.

2. *Market trends*: Keep an eye on market sentiment, trends, and news.

3. *Project fundamentals*: Research the project's team, technology, and use case.

4. *Risk management*: Set clear goals, risk tolerance, and stop-loss orders.

Some other underrated coins to consider:

1. *Chainlink (LINK)*: A decentralized oracle network providing real-world data to smart contracts.

2. *Stellar (XLM)*: A fast and low-cost blockchain for cross-border payments.

3. *Cosmos (ATOM)*: A decentralized network of independent, scalable, and interoperable blockchains.

Remember to do your own research and consider your risk tolerance before investing in any cryptocurrency.