If you are interested in a very practical, hands-on job that does a lot of good for a lot of people, no matter what age you are, whether you're looking for your first career or a new one, please consider becoming a city code official.
Code officials are the folks that work with governments to keep an eye on new and existing construction and make sure that it stays safe and accessible.
It's a good job making good money, and there are a number of places that you can get your certifications. It's also one of those practical Building Trades that always needs people, and if you're a little bit flexible about where you're going to work there are literally hundreds of job openings out there right now.
And from a long-term perspective, once you are a code official you can volunteer with / work with some of the national and International organizations that put together model codes. Model codes are books published by non-governmental organizations so that smaller cities and municipalities and really any government organization that doesn't have the budget to write its own building code from scratch can simply adopt a version of the model codes. The companies that put out model codes generally speaking have open processes that let anyone in the industry come in and help change the codes.
I work at one of those companies. We have trans activists coming in making sure that gendered bathrooms don't become law in a bunch of places. We have disability rights activists coming into push our codes past the what is required for the ADA, and into more modern, more complete accessibility rules. In both cases, these folks are minority and have to work with all the other code officials to show them why they're suggested changes are the right way to go. Anyone can submit changes and come in and speak, but if you are a professional code official currently working for a city or state that uses our codes, you get a vote on how we change things. Three to four hundred individuals vote on many of these suggested changes to the codes. That means the small number of determined people can likely genuinely move the needle in terms of what we discuss and what we implement.
It is construction, so not every work site is going to be welcoming, but I have been pleasantly surprised by how many folks in the industry are genuinely don't give a damn about anything but whether or not you can get the job done.