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Can you post photos? As noted upthread, a JM that loses early foliage for whatever reason will generally releaf without issue. The possible exception is Verticillium wilt but that usually shows up later in the season. When it does show up early, the tree will generally attempt to leaf out but the leaves quickly wilt and die off. No buds and no foliage by May is not a good sign and would tend to indicate the tree is already dead No pruning anything yet. Give it some time to see what happens. And you never want to fertilize a stressed plant. All that does is increase stress.

Probably a combination of excessive moisture and inadequate HEAT. Being tropical plants, room temperature is not high enough. I had some Traveler's palm seeds that I tried to germinate one year and they did nothing all Spring. I threw the soil out into the garden in a hot sunny location. In no time, all the plants were germinating! Convenient sources of "bottom heat" are radiators (in winter--as long as the heat is not too great), or maybe by a stove, or in a sunny window sill (especially if partially covered by glass or plastic). Soil temps of between 80-90 F. sound about right for tropicals. Also, be careful to keep soil just slightly moist but do not let dry out (I know a difficult balance).

I have found 9-pound bags of a mix of mostly millet with some sunflower seed and, I think, safflower seed, at a dollar-type store here called Big Lots. $7 per bag. Birds gobble it up in winter, but in the winter they'll eat anything; in the spring they are picky, kicking out the milo for the pigeons and doves, so I stop feeding them and concentrate on hummingbirds and, this year, suet for Ladderback and Downy woodpeckers. Also I have nyger thistle feeders (both metal mesh feeder and sock feeder) out for our sweet, tiny lesser goldfinches. To complete my first post in this forum, I spotted and got pictures of a male Northern Cardinal this morning, a rare sighting for our area (Albuquerque). A similar male bird (the same one??) was reported a few miles further north back in February. I also photographed a rare Vermillion Flycatcher in April. Maybe more birds are moving into my state -- and I'll have figure out how to feed them if they visit my apartment complex :)