Help!! My DIY Electronics Project Doesn't Work! Op-Amp Circuit Troubleshooting Diagnosis Repair

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I built this MilliOhm meter DIY project and it is not working! Let's see if we can work out what the problem is.
CHAPTERS
00:00:00 Introduction
00:01:18 PCBWay Shared Projects
00:02:46 The Millivolt Meter Project
00:06:52 Selecting The Components
00:20:11 Building The MilliOhm Meter
00:46:00 Testing The MilliOhm Meter
00:47:07 Adjusting The Settings
00:50:17 It Doesn’t Work!
00:58:44 Diagnosing The Problem
01:06:22 Enlightenment!
01:09:34 Improving The Accuracy
01:14:21 Epilogue
Used in This Project (links are affiliated, I get a small commission from all sales but you pay the normal price)
SMD Tweezer / DIY Kelvin Probe
www.aliexpress.com/item/32855...
OP07 Op Amp
www.aliexpress.com/item/10050...
IRF540 Mosfet
www.aliexpress.com/item/32790...
1W Zener Diode Pack
www.aliexpress.com/item/10050...
Trimmer Potentiometer Pack
www.aliexpress.com/item/32912...
5 Digit Volt Meter
www.aliexpress.com/item/10050...
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Richard