A standard audio file is only two channels. So it can’t contain 30 Audacity tracks one on top of each other - the song tracks must be following along one after the other, in one stereo Audacity track. Correct? Or have you already split the single file into 30 Audacity tracks standing on top of each other that you have to scroll up and down to see?
If you only have the one Audacity track, then doing the operation manually is fine. You can click at the first break between songs, Generate > Silence of 10 seconds, Edit > Copy the silence, click at the next song break, then Edit > Paste. Click at the next break and paste again.
If you want to use Time Shift Tool, click at each song break then CTRL + I (as in first person singular) to split, then you can drag rightwards with Time Shift Tool.
If there are silences between the song breaks you can extend the silences in one step with this plugin: Extend Silences.
If you really have 30 tracks on top of each other, click in the top track, HOME, hold SHIFT and hold DOWN arrow until you have selected in the bottom track. Then generate or paste silence.
Gale