If I was your insurance agent, I wouldn't write insurance for that building. I have built about a dozen pole buildings, and around here they need to be engineered for 50 lb/sq ft snow load. I doubt yours will stand a 25# load.
As I see it your 2 main areas of weakness are the center section with its 22 ft span. If I wanted to keep that building, I'd bring in enough lumber to form W trusses at every rafter. Sure they won't look like factory trusses, but you can get a lot of strength with a 2X6 bottom cord and 2x4 for the webbing. Years ago, there was a booklet put out by the ag extension service having the details for building pole barns and making your own trusses by using 1/2" plywood for the joining plates. It is less convenient to do it now, but is a lot easier and cheaper than repairing or rebuilding a collapsed building. If you do the truss work on that 22 ft center span, use a nail gun to put lots of nails to attach the chords and webbing with the plywood. Take a little extra time and clinch over the excess nail length on the backside.
The second issue is the lack of sufficient nailing with spikes from the rafters to the poles. 3 each is about 1/2 of what you should have. As none of these rafters is "let in" to the pole, its entire load carried to the poles is supported only by those 3 spikes. Each spike can hold only so many pounds before it fails by bending or shearing. Make it 5 or 6 spikes at each pole junction.
Your steel rod reinforcement with 3/8" re rod with probably 3/8" reddi rod is way too undersize, but certainly better than nothing. When I do that kind of reinforcing, it is min of 1/2" rod on short spans, and most commonly 5/8". On your 22 ft span, 1/2" rod is the minimum I would use. When the tension gets high from heavy snow, standard size washers behind the nuts will pull right into the wood. So make your own washers out of flat stock steel 1/4" thick and about 2" square.
With the size of that building and its likely usefulness to you, I think it can be adequately reinforced.
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