This year has been extraordinary for Kagi ( https://kagi.com ).
Kagi is a paid alternative to ad-supported search engines like Google and DuckDuckGo. It has recently revised its pricing model, reducing the cost for a plan with unmetered searches from $25 per month to $10.
Kagi boasts the following (and more) features:
Blocking or boosting specific domains in your search results
"Lenses", which are individual setting profiles (e.g. region locks, domain whitelists) that can be applied to search queries
All of the Bangs that DuckDuckGo has (e.g. type "!yt" in front of your query to immediately search on youtube.com)
Universal Summarizer, which works with any website, PDF document, YouTube video and more
This blog post goes into full details about Kagi's capabilities.
This is fantastic. I've been a $5 Kagi user for a few months and have been really enjoying it. The only issue has been that sometimes when I'm working on a project I need to blow through a ton of similar queries to find what I'm looking for; I've been forced to switch back to google for those. Now I've upgraded and am going full Kagi.