Raising ABV after secondary?

[Tennessee Brew]

Ok so I intentionally made a low ABV Peach however I really don't like it, it is a little too low, came out about 7-8 percent.
So I want to do two things here, bump the peach flavor and bump the ABV. so I figured either a peach concentrate or just get some peaches and go to town smashing like a mad man and just add sugar to get the ABV I want, at least 11 to 12%
Thing is this thing has sat for maybe 3 months now in secondary. Should be ok? May have to pitch a tad of yeast again?

 

[Kickass]

Add a sugar source and see. I’d bet there’s enough yeast to get things going again. Might have to be patient but I’d bet it works