Finding a Reddit post that you have liked in the past can be a daunting task, as there is no direct way to do so within the Reddit interface. However, there are a few workarounds that you can use to find a post that you have liked, depending on when you liked it.
If you liked the post within the last few days, you can try using the “Recent Activity” tab on your profile page. This tab will show you a list of all the posts that you have recently viewed, commented on, or liked. If the post that you are looking for is in this list, you can simply click on it to view it again.