Making a "good" song alone is a huge deal. The more instrumentation, the more complex the job becomes.

You may or may not agree with the following statement.

"A song is a composition made up of lyrics and music, with the intent of the lyrics being sung, for the purpose of producing a proportionate feeling or emotion in relation to a particular matter."


BMI is a good source of ideas.

A quoit

"In many instances, multiple writers contribute to the topline, with one or more of them contributing the lyrics and others crafting the vocal melody. In some cases, one writer might compose the verse melody while another writes the chorus melody. Similarly, a backing track might be created by more than one writer. For example, one writer might create the beats, while others compose the chord changes and instrumental sounds with the piano and guitar."

It is certainly possible to write lyrics to pre-existing music. It is also possible to write music to pre-existing lyrics. Bernie Turpin writes lyrics for Elton John, and Elton devises the music with little interaction with Bernie.

Because we have software, BIAB, and many others, which can provide the different elements needed to construct a song, it is theoretically possible to create a "good Song" alone. Still, other than some accidental combination, understanding of and a skill level with the different elements is needed.
Even if someone has all the needed skills, the limitations of the software confine the song to those limits and processes.

Popular styles often would include drums, bass, keyboards, guitar, and vocals to include the lyrics.

If, for example, you are a "skilled" Drummer, bass player, keyboard player, lyricist, top-line writer, arranger, producer, guitar player, mixing engineer, mastering engineer, and a dozen or more other skills, it should be simple to write "good songs" alone...lol

Some good songs do get written by only one person, but in today's world, teams of people are the most common way complex things get done.

I write lyrics that, in my own opinion, are sometimes good, sometimes bad, and mainly irreverent to anyone else but me. As a result, I don't stress too much over the quality or what anyone else thinks about them.

Billy

“Amazing! I’ll be working with Jaco Pastorius, Charlie Parker, Art Tatum, and Buddy Rich, and you’re telling me it’s not that great of a gig?
“Well…” Saint Peter, hesitated, “God’s got this girlfriend who thinks she can sing…”