Reverse seo means to do the same process of your competitors who are ranked on top positions.
for example if you see a website on top of google having 3000 backlinks, you would try to achieve backlinks the same he did to get ranked.
it works but you cannot get ranked to the same position doing same seo what the top ranked website did. there are many other factors involved. domain age, Exact match keywords.
Do not only count the number of backlinks of your competitor, count the quality, domain age and even hosting as well.
i guess i have explained enough, let me know if you still have questions