If you go to https://piefed.social/search you'll see two new fields.
The "Minimum score" field is where you can put in a number and only posts with at least that many net upvotes will be shown. This will help you weed out posts from RSS feeds, by bots or generally low-quality posts.
There is also a NSFW one:
The first option is the default one and will remove NSFW content from your search results based on what your profile setting is. The others are for overriding that so you can search for sexy linux posts without seeing regular posts about linux. etc.
piefed.social doesn't have NSFW communities so this won't be very interesting here but feddit.online has plenty.
example