Beginner trying to get faster during quarantine

Hello, to introduce myself, I’m a 16 year old student (74 kg, 165 ftp). I bought my first road bike in summer last year, but because of the weather and lack of time I haven’t trained much. I’ve now bought a smart trainer and, so I thought trainer road is the place to go. Now to get to the question. I currently have quite a bit of time thanks to the lockdown, so I’m really tempted to start by doing medium volume base training. But from what I’ve read, it seems like low volume may be better for beginners? What do you think? Which one of the plans will ensure the bigger fitness growth?