Using a free Vocaloid Lite voicebank (like Tone Rion) versus a paid one (like Hatsune Miku V4X) is like comparing a student violin to a Stradivarius. The Lite banks often lack "E.V.E.C." (Enhanced Voice Expression Control), which means long notes will sound flat, and you cannot add vibrato easily.
But here is the secret the industry doesn't always advertise: vocaloid voicebank free
You now have 30 days to compose as many songs as you want. You can export audio files (WAV/MP3) during the trial. Once the trial ends, you cannot edit the project file anymore, but you can keep the rendered audio. Using a free Vocaloid Lite voicebank (like Tone