I'm going to give the very unsatisfying answer of "it depends."
There's a lot of solo content in Smash Ultimate, not just including World of Light (which I think is just kind of so-so but is at least quite long) but also arcade ladders for each of the dozens of characters and various other modes and custom battles. So if you like single player fighting games especially in Smash's style then there's a ton there for you.
On the other hand there's no strong solo story like in a Netherrealm game, and the customization stuff is much weaker than in something like the Namco games (which also has better story stuff) so it really comes down to whether you enjoy the wacky fighting with tons of stages, weapons, and rule variations.
Personally I enjoy Smash and I played it almost exclusively solo when it came out and got about 40 hours out of it, so I wouldn't discourage you. But the Smash gameplay doesn't gel with everyone, and the stuff around the gameplay that a lot of fighting games have added (better stories, great character cutomization, etc...) just isn't there.
World of Light is essentially just a series of reasonably fun challenges against various opponents and formats, with a few boss battles thrown in. It's nothing like Subspace Emisary. But if the idea of playing a whole lot of single player Smash appeals to you then there's a ton to do in the game, it's polished, fun, has literally the best soundtrack in gaming with all the music that's in there from various games, and still manages to surprise and delight from time to time.
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