That sort of "diversifying" is potentially not very practical - video production takes a lot of time and effort, so either you cut your output there to have time for a part-time job (is the part-time job giving you as much money per hour as the extra work you could have put into making more videos?) or you're now working a job and a half.

If you can make more from YouTube ads and per-video Patreon subscribers than you could by cutting your video production by half to fit in a part-time job, it might make more sense to stick to just videos but keep tabs on local part-timer opportunities. Less stable, but a higher net income until your channel goes down -> more able to last until you can get a part-time job? Not sure; I've been lucky enough not to have to worry about that sort of thing, so this is mostly speculation.