2hr layover enough?

We booked some flights without noticing the relatively small window (we just grabbed the cheapest deal, bundled via kiwi.com)
3 connecting flights, all self-transfer
Mexico -> San Francisco -> Fiji -> New Zealand
The 2hr connection is in San Fran
Checking with ChatGPT, it says it’s near impossible… is that correct?

Don’t think we can get a refund, but would we be better to just book new flights, than risk paying more on the day?