"Stepping up," as you call it, begins in public forums, where legitimate questions are asked and concerns are raised. This is a soccer forum, where I am posting on a thread begun BY SOMEBODY ELSE.
The solution for the fitness issue is simple. A BASIC ANNUAL fitness test, offered on a quarterly basis, including certain age-based MINIMAL standards for (let's say) a 2-mile run and interval training. Fail the test once: retake next quarter. Fail retake: probation and retake following quarter. Fail second retake: immediate loss of certification/assignments.
The solution for in-game evaluation (at each level) is fairly simple. Coaches submit mandatory post-game evals (as short and simple as GOOD, AVERAGE, or NEEDS IMPROVEMENT) to an assigner/evaluator who follows up with his own evaluation for those officials who repeatedly fall short.
The solution for "mentoring" is simple. WHEN POSSIBLE, each crew includes a veteran, mid-level or higher official and AT LEAST one younger official who is learning his/her trade. At least 3X per "season," younger officials are formally evaluated by their "mentors."
To improve certification classes: 1) Limit the classroom time to 4 hours/year. 2) Add an outdoor component that includes fitness testing and situational instruction.
To limit conflicts of interest, require each official to fill out a bio form that includes affiliation with schools/coaches/etc., AND allows each official the opportunity to identify any prospective problem assignment.
To help offset the salary issue, establish PERFORMANCE-BASED pay scale, with enhancements for additional training/classes completed.

Any LEGITIMATE official who wants to contact me privately may do so by private message.