It's based on the number of posts and avg likes, here's an explanation on how to do that,
" 1- Between 0 and 2.500 followers you should use 75% hashtags(with total post count 5k-250k) and 20% hashtags(with total post count 500k-1mil)
2- Between 2.500 and 15.000 followers you should use 70% hashtags(with total post count 5k-250k) and 25% hashtags(with total post count 500k-1mil)
3- Between 15.000 and 50.000 followers you should use 30% hashtags(with total post count 5k-250k), 30% hashtags(with total post count 500k-1mil) and 10% hashtags(with total post count 1mil-10mil)
4- Between 50.000 and 100.000 followers you should use 20% hashtags(with total post count 250k-500k), 40% hashtags(with total post count 500k-1mil) and 40% hashtags(with total post count 1mil-10mil) "
It's not my strategy i copied it from an old thread here i think, i couldn't find where, but it's work that's why i saved it on my laptop