There’s nothing nutritionally wrong with stage 2 baby food; it’s fine to use it up. It’s just that it’s not as interesting as stage three and doesn’t accustom the baby to more “real/solid” foods. But nutritionally, it’s like you eating soup instead of steak. It’s all good.
Feel free to use it as is, or if you really want to keep pushing the envelope, incorporate it into more solid food: the puréed fruit and veggies can be incorporated into baked goods, deserts, etc. Your imagination is the only limitation.
Of course there are always women’s shelters and food banks that would welcome baby food. Totally up to you.