Well, perhaps taking one too many pages from Botw and Totk's books, newer, stronger enemies (and variants like those already existent but stronger and with a differentiating feature of some sort- like "Blue Klown", for example) could spawn on top of the old ones. Then, you can have fun seeing new monsters (adding more gameplay value and perhaps replay value as well) and still feel like a god, pwning all of those little creatures with a +500% scale Draginslayer.