I have a 2500+ word post, and the keyword density is 0.3 is it ok or should i increase it
It depends man. My keyword density is usually anywhere between 1 to 2%. But you can’t predict you will rank higher if you have high or low keywords in 2500 word post. What matters now is the long tail phrases which means Google is now looking not into keywords alone but it is looking for combination of keywords called “long tail keywords”.
Yes. LSI keyword.
Yes it is . KD doesn’t matter till it comes naturally.
Yes, If You are used LSI Keywords, no bother about keyword Density. Google Will Consider Keyword Phrases also a Keyword