How to Make voiceover better in post

I am hoping for suggestions on getting a better product out of this recording. It was recorded using my iPhone 15 and a DJI Mic. I recorded it in my truck, because any quiet room I found in our facility resulted in reverb issues. Now I'm battling a "boxy" sound. Its not terrible which is why I thought there might be a post process fix, but I understand I may need to record again... perhaps under a blanket and with our Rode VideoMic GO II. 

I've lightly processed this file in the following ways; Normalize to 95%, Noise Reduction (Process), and silenced portions where I could be heard breathing and mouth sounds. My audio training background consists of youtube videos I seek out when I'm having issues.

Thanks for any input!