need help

hi there
i have a channel since 2015 and it's just started taking off now i've got to 10900 subscribers but unfortunately two months now youtube demonetized my channel because of
Reused content
is there any ideas of how to get over this issue because i don't know where's the thing which make the problem and youtube don't interact with channel owners to specify the issue so i hope to find some feasible suggestions here .
thanks

try to remove any duplicate video (that you uploaded twice) if there are such, or videos that you are may not the owner, delete those and try to re-apply to the YPP they will re-review your content
note that a re-use for them can be an original video that you deleted in the past since it didn't perform well and re-upload it again to your channel...