$500 via Verizon e-gift card (sent w/in 8 wks). Activation of 4G LTE/5G phone on 5G Get More plan req’d. Device must remain active for 45 days. $500 charge back if service cancelled w/in 12 mos or eligibility req’s are no longer met. See vzw.com/bring-your-own-device for details.
I think you are out of luck, unless it is saved on your phone. Texting details online only go back three months, and even then it's just the phone numbers texted to/from and the date/time the texts occured. Content cannot be retrieved.