[Fish Sandwich]

Personally I'd largely ignore the anniversary and just focus on making Super Ninja Steel good. Considering PR series last 2 years each now I don't really feel like we have enough distance from Super Megaforce for there to be any need to do a big celebration again. Even Super Sentai downplayed things with Zyuohger.

I would however love to see the early Ninninger episode with Ninja Red and Hurricane Red adapted in some fashion. They used the mecha footage already but they could probably work around that in any number of ways if they felt like it.

Alternatively do something we haven't seen in forever and give us a proper team-up with one of the other Neo-Saban teams. Dino Charge is the obvious choice, but doing Megaforce would allow them to use other teams by extension (celebrating the anniversary much like Zyuohger did with Gokaiger showing up), and Samurai would give the whole thing a cool "ninja vs. samurai" angle that could be fun.

The problem with that idea though is that even if they could get all the actors together, there's no Sentai footage to use with any of those combinations, and it doesn't seem like Saban is really comfortable making that much original action footage for even one episode, which is a shame, because I really miss team-up episodes.