I think it might be a good idea for Spotify to open a new user license besides free and premium.
I know the membership has not a high cost, but it is a monthly payment, just as any other service at home. If there was a cheaper membership with what I need I would get it.
In my case, additionally to the free version, I would like to reproduce music not only in shuffle mode, I would also like to have unlimited skips and to be able to go to the previous and next song. I don't need to download music and have it available offline, for example.
Ads could be eliminated or, at least, reduced.
I think this could enable Spotify to reach more users and to get more memberships.