The reversed Hermit indicates that one should not blindly rely on outside advice when it comes to finance. Hence, the surest solution to making a big financial gain in the long run may be to do thorough research and make informed financial decisions. It is important not to be influenced by the opinions of others and to maintain an objective perspective.

The reversed Ten of Pentacles indicates that you should consider your options carefully before deciding how to invest your money. You might consider investing in stocks, but make sure you're always following a well-thought-out investment plan that fits your needs. You don't have to rush decisions and take high risks. Instead, choose wisely where to invest your money and always try to diversify your sources of income to increase your chances of long-term success.

Finally, the reversed Knight of Cups indicates that you need to avoid situations that involve uncertainty. If you want to achieve great long-term financial gain, you need to find investments with good potential and low risk. This means doing extensive research to identify the best financial opportunities and evaluating them carefully before making the right decision.

In conclusion, these three cards suggest that to achieve great long-term financial gain, you should do thorough research, make informed decisions, and avoid uncertain situations. You should also carefully consider all available options before deciding how to invest your money and diversify your sources of income to maximize your chances of success. If you follow these guidelines, you are more likely to achieve great long-term financial gain.