I don't know about the best route or if there's a viable one to get it to its original state, but if you want a replacement, I think that this is what you have:
https://www.amazon.com/Calypso-Basics-88660-Enamel-Colander/dp/B07FM7W1SJ
Amazon's out of stock, but it gives the brand and model number -- "Reston Lloyd 88660", if you want a new one.
Camelcamelcamel says that it was last available in early 2021 for about $33 (with a small price dip at the end):
https://camelcamelcamel.com/product/B07FM7W1SJ
So I wouldn't spend more than $33 of time and resources on repair effort, since I suspect that there are probably some out there.
EDIT: It looks like their current model is one-tone rather than two-tone:
https://www.amazon.com/s?k=lloyd+reston+collander
I don't know if that matters to you.
EDIT2: I see the two-tone being sold on EBay ("lloyd reston collander") new, albeit not currently in pink, if that's the color you have.
EDIT3: Apparently Lloyd Reston is the "exclusive distributor", and "Calypso" is the brand.
If you have magenta -- I'm not sure from the picture you have, looks kind of salmon, in between their pink and magenta collander, but could be lighting -- this is their current one-tone model:
It's $23.
EDIT4: bonanza.com has two-toned ones, but not in pink or magenta, just orange, black, or lime. And they're significantly-more than the one-toned ones, at $37.
EDIT5: Well, I don't see it on Google Shopping, which is usually kind of the authoritative source, because they index pretty much everything. That being said, it does look like this sold through major retailers, including Wal-Mart, which is everywhere, so I would bet that there are a bunch out there floating around in private hands. Even if you can't restore your existing one, you might keep an eye on used markets like eBay, Facebook Marketplace, Craigslist, stuff like that, wait for one to pop up.