There's so many of us that want Jon restored to what he was. I'm not the biggest fan of Jon but that's mostly because of how he was handled from inception.
If I had my way, the way I'd fix him would be to slowly reveal that the Jon Kent that we've been following lately is really the post-crisis Matrix. I'd make it so that Matrix was somehow captured and experimented on by Ultraman as well and developed a psychological fixation on Jon similar to how they developed a fixation on Superman when they first came to the post-crisis earth.
I'd make it so that Jon was still a kid and still trapped on Earth 3, maybe a little bit older like 1-2 years older. He'd be trying to be a hero on Earth 3.
I'd change Matrix's gender to they/them and keep the relationship with Jay and preserve the bi-sexuality and connection to Superman. Jon would be rescued in a big event.
All the history of the aged-up Jon would still exist. LGBTQ themes could still be explored in the Superman family books in even more ways. Super Sons would be able to return as a series. I'd just wave away the Bendis Legion as a product of hypertime, which to be fair all Legion stories kinda are since the advent of Hypertime as a concept.
What do folks think? How would you fix Jon? Does Jon even need fixing? You decide!