I configured Reddit as a "Lense" (similar to what Kagi uses for things like searching across Forums, or news). With that, now I have a simple toggle at the top of Kagi which allows me to immediately turn a search into a Reddit search.
I did the same and added a custom bang so I can use it from the address bar directly (!r pointing at https://kagi.com/search?q=%s&l=8 where 8 is the lens id).
Probably least a third of my queries are preceded by an !r now. A third of the rest are now question mark queries that activates their AI fast answer. It's like the google info box on steroids since it can answer any query and it works with lenses to restrict the fast answer to specific domains.
By the way, you don't have to manually add a custom bang and point it to your lens id, you can configure a bang for the lens directly in the settings of your lens
It took me way too long to start using Lenses. I've been a Kagi user for a while now, but lenses never really seemed that useful. The unlock for me is that I'm often looking for 3D models, so I added one for all the usual 3D model suspects (Thangs, Printables, etc).
Thats the best way, because then what you're looking for gets surfaced rather organically, and its right there, so you don't have to go out of your way to find it.
Generally I've started using bangs and lenses for changing searches in a wholly categorical manner. I.e. the !i bang for image search.
I did change the !p bang from podcasts to activating the programming lens, because programming tends to have a lot of terms that overlap with more general language, and so sometimes its nice to swap in and out of that mode.