new keywords

what are the low competition niche with high search volumes in 2019?

Hello everybody, First of all, theres is a TV series show which has been released on October in 2013 and will be continued, but the thing is using google keyword finder i can't find keywords for that tv show, the ones like "watch dr house online", "glee episodes online" i hope you understand...

My site is indexed yesterday on google and i want to erase all keywords which i was put first time and put new ones. Can somebody tell me what will happend if i do that? Did google remember my first keywords and if i change with new ones will not give a effect with second ones? Can my site be...