What type of content would be better?

Hi. 2 years ago I posted one video on YouTube, history niche, in my native lang(~~35mln residents) using my voice and pictures only. Except my microphone everything was top quality but I didn't want to spend any money into. Now it has like 15k views with few comments. Should I go into? Or channel with motorcycle restorations, building customs etc. would be easy to gain viewers and more $ potential? I have no idea how to monetise history channel in the future, motorcycles imo has more potential because of parts, oil etc. not only adsense.

Yes, you should more focus on Electronic, Motor Cycles, if possible pets (Dogs).

motocycle restoration and custom build have huge potential
history topic works if you explain anything mystery, kind of exploring details videos