Which occupations are trending leftward?

[RINO Tom]

Not sure about ~trends~, but this has been said before and bears repeating:

Jobs that require a lot of education and still do not pay that much are going to produce extremely Democratic-leaning voters, and the opposite is going to produce very Republican voters.  There are obviously still grad degrees that I would wager still lean Republican like MBAs (from my experience, as someone who recently got his), and there are obviously some low-education-requirement-high-income occupations that will naturally lean Democratic, too (e.g., a small business owner of a "leftie"-themed thing like a line of yoga studios or coffee shops).

EDIT: My guess of people I know, personally?  Moderate females who make between $75k and $100k (for comparison, that is $156k to $209k in Manhattan) and weren't super "into politics" before 2016 but ARE quite into Instagram.

[RINO Tom]

Based on donor data just about everyone who receives a W-2 is trending to the left.

The only ones that are trending Republican are police officers, self employed independent contractors, and small businesses owners.

People who work big corporations are more likely to trust government and value economic freedom less (especially as cost of living rises to point that they won’t get ahead anyway).

Those who leave big companies to be self employed likely value freedom and want less government intervention.

The problem for GOP is entrepreneurship rates are going down and many gig workers will become de facto employees with changes in labor laws

While I believe you, I am honestly surprised there is that much room to "trend right" among "small business owners."  They have been extraordinarily Republican for an absurd number of years.