Okay.
1) Most jobs are kinda crap about 2-4 years in. The exciting new-ness is gone, and the grunt work and rules (and supervisors) are more numerous.
2) If it is reasonable to get your PE, do it. Many engineering jobs don't require it, but you have more opportunities with it, especially with government / municipal roles, which you may like if you don't want to be a manager and want to keep standard hours. (think city engineering department).
3) A lot of humanities majors work for government, often in management roles for higher pay. Some are project managers. Some are HR administrators. Some are CPA's, sales, etc. Humanities majors can take on technical roles, too, with interest and a bit of extra classes.
4) I googled "Technical Sales Engineer Jobs" and Indeed's first hit was for Ingersoll Rand (HVAC Systems). The next hit was for "MDProjects" who provide "reservoir characterization, modelling and simulation;" Duties are standard for technical sales: "Apply technical expertise to assist our clients and internal team in preparing project scopes and technical proposals." Lots of travel required (which is a lot of fun before kids). A third hit was for a company that manufactures boilers. "As part of the project management team you will be expected to work with the sales, service and project management team to create designs that meet the project scope of work "
Your local area will have different companies, of course, but the jobs are as varied as the manufacturers. I have done simulation and modelling as part of my (limited) sales, and that was fun, but always a new project , seeing new things, was the best part.