Hang in there Andy-—’grow or die’ we gardeners know what a crapshoot it all is. One bit of advice from our pal tobacco /johnny is to have a good amount of backup plants. Glad I took that advice this year as I had to do a 2nd round of replacement ‘maters and also about half my pepper seedlings either died, stunted or rotted at the stem base. backups to the rescue and i didnt even do enough of those but still an adequate amount for my small plot. My arugula is like a weed its so hardy whereas I cant grow any spinach for squat— a complete bust. Sometimes you win and other times you lose in the world of greens.
Have you ever tried growing spinach in mushroom compost? I did that one year, and it produced 100% better than any other combo.