Assuming you've converted from a V6, it has around 25 apps so I'm not sure where you get 80 from. I've a suspicion that Pluto may be one of the apps that isn't currently on TV360, but @Ernie_C may be able to confirm.
You won't be able to abandon TV360, the conversion process is one-way and irreversible. The two platforms are completely different and there are functions/apps on V6 that TV360 doesn't have.
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I'm afraid that once you switch/convert to the 360 you cannot go back to the previous box(es).
There has never been 80+ apps on either the V6 or the older Tivo boxes.
The current list of apps on the 360 is:- Al Jazeera, All 4, BBC iPlayer, BBC Sounds, Britbox, Deutsche Welle, Disney +, France 24, ITV Hub, My5, Netflix, Prime Video, Radio Line, STV Player, TV Channel Upgrades, VEVO, VM Store, WSJ, You Tube and You Tube Kids
The last list I saw for apps was tips-and-tricks/your-new-virgin-tv-apps
Available on V6 only
Available on V6 and Virgin TV 360
Available on Virgin TV 360 only