What am I doing wrong?

[estación seca]

I haven't grown the Maxillaria. Did your source bloom it? Maybe you got a shy clone. But I vaguely recall reading other threads here about people who can't get theirs to bloom. I think others offered specific advice.

Are you giving the Phals a day and night cooldown in the fall? Here in metro Phoenix we put ours out on the patio in shade for a few weeks starting in late October, keeping an eye on the night thermometer (and watching for curve-billed thrashers.) Our fall days are routinely in the 70s-80s F / 20-30C but nights are 50s to 60s F / 12-17C. Hybrid Phals seem not to mind a few cooler nights if the next day warms up. The earliest I've had frost has been November 20 so you need to adjust for your climate. Some of our members keep them out as long as days warm up, or until they see spikes, whichever comes first.

Bulbos during the growing season are almost aquatic plants. I've quoted from Bill Thom's Bulbo book. He grows in baskets of sphagnum moss and waters every day. If it's over about 85 F he waters twice a day. He waters each basket 4 times with the water wand, once for each side. He also fertilizes a lot.