Make sure it’s not a faulty contact. For that, you can use the Ifixit Teardown and individual articles as a guide. Disassemble the phone (but not the components), clean the contacts carefully with isopropyl alcohol and a cotton swab, leave to dry 24h, then reassemble paying careful attention to alignment of contacts. Boot with neither SD card nor SIM to start with.
Don’t over-tighten the screws: the assembly needs to be firm but damaged screws are a real problem. Read this and have a look around. Don’t do this if you’re not confident with fragile electronics, but you could see if there’s a fairphoneangel in your area who might be able to help.
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