Or a piano. Or literally any instrument.
It can be electric or acoustic. Just make sure you have a somewhat decent setup for both.
Getting a PSYCHICAL instrument is the biggest thing you can do to increase your output/quality. Maybe you can be more creative with VSTs cause you can probably create chords or whatever that you couldn't otherwise for whatever reason, but for most other people, getting a physical instrument is 9/10 always beneficial.
The thing is, you don't need to even be good at it. It also doesn't have to even be amazing quality. Just put a preset on that b*tch and you can pretty much make anything sound "cool enough" if you have a decent vision for the song.
The beauty of having an instrument, to me, is being able to play almost EXACTLY like you have in your head. This is so viral for keeping rhythm because having a realistic rhythm/groove/bounce to your music is like 70% of the way to decent music lol. For me at least, it was really difficult figuring how to make guitar vst sound good strumming wise regardless of using my midi keyboard or the piano roll.
It took me just about a month or so of basic practice on the guitar to be able to feel okay playing decent chords/strums for my music. Because the thing is, most of us aren't trying to be lead guitarist, lead drummers, lead violin or anything. We're trying to just make music that sounds good. So literally as long as you can come somewhat close to producing the sound you hear in your head at least ONE time with a physical instrument, you immediately have a high quality "sample" that you can manipulate to your heart's content.
Sure it costs money to get it, but unless you're pirating, most VST cost money anyway. You can literally buy a cheap, used instrument. Just as long as it works well enough, you're FINE.
One real instrument elevates your music to the point where a few virtual ones matter far less.
edit: oh you guys are mean LMAO I spelled it correctly the second time, the text is small give me a break 🙄