Reattach spring (finger) contact

I'm trying to repair a Pixel 4a 5G, and in the process, took the midbody off the back to air it out (it had some minor water exposure that killed the screen).

In the process, one of the very small spring contacts came off the PCB on the left edge of the phone (on your right if you're looking at the back of the midbody, at all the phone's internals). This is a contact that's meant to press against another contact in the back of the phone. I still have the detached contact.

My soldering skills are, well, crappy. I reattached it at one point with some one-part conductive epoxy, but it's come off again. What would be the best way to put it back? 2-part epoxies are available, although very expensive. I could try my hand at soldering, but am afraid I could really mess things up.

Thanks

(here's a picture of what I'm talking about, and the messy job I've already done once)