Take the good track, rick click in project window duplicate, delete the other track. This should solve your problem. We do not have enough info here to explore your issue IMO. Don’t delete the input output channels. You can hide them in the inspector if you don’t wat to see them.
When learning Cubase it’s very common to get silence issues, especiallyv if you have been experimenting. There can be lots of places to mute or misdirect the signal. For example if the MIDI is not set up right. Open your instrument, check the output (usualy MIDI 1, then ensure Cubase track is also set to MIDI 1.
Very often, silences are not Cubase bugs, Cubase is set up wrong. However, people sometimes get issues with the mute button, (looking off when it is on) especialy after a track has been disabled and reenabled. As Martin says, deactivating mutes on the top of the project window usally fixes this. Best to move on where you can, as you get to know the program
Does the issue happen only during playing the VST or also during playback? If you aren’t monitoring the track or, depending on the monitoring style your settings are set to, record-enabling the track, a VST will produce no sound. Try pressing the little speaker button next to the record enable button and see if that changes anything.