Traffic Issue

hi, I have a domain where i hosted AI images from diff category and i post my own creation also.
earlier i was using buddy press and traffic was gaining automatically, but since is moved to more simpler theme post style. My traffic has declined. and time spend on site is also very low.
do you have any idea what might me the issue,
no seeing images is much easy, in buddy press there was diff user diff group, Personally i would spend much more time on simple website rather then social media style site where to see data i have to go to diff user profile.