One of the best things about reddit was looking for answers or other users with the same problem as you, and since Google didn’t really help with that anymore and instead insisted on giving you business results, the best practice was to put your search terms in followed by ‘reddit’ and you’d find your answer.
If you are looking to return relevant, well ranked results based on freeform queries you’d be better indexing into something like elasticsearch. Otherwise you’ll be reinventing solutions to well understood problems, like stemming as a very basic example.