1. Frequency Analysis:
* Count the frequency of each letter in the message.
* Compare the frequency with the standard English letter frequency.
* Try to match letters based on their frequency to guess the substitution pattern.
2. Pattern Recognition:
* Look for repeated letter sequences or patterns in the message.
* Try to identify common words or phrases based on these patterns.
3. Brute Force:
* Create a table of all possible letter substitutions (26! combinations).
* Write a program or use a tool to test each combination until the message becomes readable.
However, without more information or clues, it's impossible to know for sure what the original message is or what cipher was used.
Let me know if you have any more clues or context!