Best dehumidifier for small bathroom?

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I replaced the vent fan with a brand new

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Is the new one working properly? Replacing the vent wouldn’t help your situation if there was another issue going on. For example if your fan vent was clogged.

You do have an air infiltration issue and bathroom exhaust vents are often the source. Are you sure the exhaust fan is properly sealed from the attic side? The exhaust fan flapper/check valve properly closing? Any other other possible source of air infiltration in the bathroom- leaky window, etc?

You could use a smoke pen, incense stick, or thermal imager, even an inexpensive one, to determine the source(s) of air infiltration. The better approach would be to find the cause and fix it, rather than relying on a portable dehumidifier.

The exhaust fan is leaking, seal all the holes on it and seal where it penetrates the sheet rock. Then disconnect the the exhaust fan from the duct that takes it out the house and install a spring loaded back draft damper instead of the crappy one that came with it. Assuming your attic is traditional insulation and not foam let it blow into the attic. I will get down votes for this but that’s going to fix your problem.

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I threw the insulation over the area. I've never done the vent installation this was my first time. Is there something additional I need to do to ensure a proper seal from the attic? The fixture sits flush against the ceiling

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I would use foam sealant in a can from the big box store applied around the seams where the fan housing butts up against the ceiling drywall, sealed from the attic side of course. Plus the loose insulation.

I bought a very small one from Walmart and have been very pleased with it. I empty it about every two weeks.