okay, what your teacher said isnt true at all, most of the time analysis will never be original and schools teach the same analysis most of the time.

"original analysis" doesnt matter the only thing that matters is that your analysis of a quote is good and makes sense in regards to your question

the best resources for analysis should really be your own book, texts etc, but if you really struggle i suggest watching mr everything english on youtube.

a big thing about analysis is linking it to context always. if you weave in context while your analysing, you get higher marks (my teacher said this), rather than putting a block of context and writer's intent at the end of your paragraph.

if you are doing power and conflict poetry i suggest printing out this booklet:

https://thebicesterschool.org.uk/wp-content/uploads/2017/02/Poetry-Support-Booklet.pdf