Insurance company don't/won't engage individual to do adjusting job. Its B2B arrangement.
Freelance...subject to adjusting firm. Usually, it is for those experienced retired person for niche expertise i.e marine hull etc.

Good career? Good money? [B]
Just another salaried job. The margin for adjusting firm is thin. Those big firms depends on volume for their operating expenses.

Not all cases require adjusting. The loss amount needs to cross certain threshold before insurance company assign the case to adjuster.
For motor claims, if its panel workshop and within limit, approval is via system.

For after retirement?> Unless you like to write report, kena tendang report, dispute report, face hostile clients...all part of the works. + dead lines.

Marsh is broking firm. Not adjuster in MY.
Big firms i.e Mclarens, Crawford, MSM, Mestari etc.

Usual case don't need to face client. Motor case, rarely.
Complicated cases / huge losses subject to claims dept's discretion aka passing the ball. For instance, factory fire loss which may includes consequential loss claims etc.

Only those with relevant & niche experience in adjusting. Those rarity skillset /class of insurance.
For non experience/newbie, = NO.