If you invest €100 in ATOM$ATOM and hold it for 15 years, your potential profit would depend on various factors, such as:

1. Price appreciation: If ATOM's price increases over time, your investment could grow in value.

2. Staking rewards: As a Cosmos validator or delegator, you can earn staking rewards, which could add to your investment.

3. Network development: The growth and adoption of the Cosmos network, its technology, and its use cases could impact ATOM's value.

To estimate potential profits, let's consider a hypothetical scenario:

- Assume an average annual price increase of 20% (which is a high estimate).

- Your initial investment of €100 grows to approximately €1,638.61🤑🤑🤑 in 15 years, based on compound interest calculations.

Please keep in mind that this is a highly speculative example and not a prediction or investment advice. Cryptocurrency investments carry risks, and prices can fluctuate significantly. It's essential to do your own research, set realistic expectations, and consider your risk tolerance before investing.