grape wine

I froze my grapes and berries whenever I had extra left when I would routine grocery shop. Mashed them, pressed them, and put it into a 1-gallon carboy. I put in 1.5 Campden tablets in. Rather be a little over sterilized then vice versa with the potential of them harboring any of the crap nearby...

hello I grew my own grapes for the first time, and made my first EVER wine. I bottled and waited for 6 months. Opened a bottle -- it's tasteless. High alcohol but that's all. What should I do to remedy this? Anything I can add now? I have 17 bottles :( M