The first part is Q&A. It is not good to say too little. There must be expansion, but the expansion must be measured and measured. It is not that the longer the better. The scoring standards for the IELTS speaking test clearly stipulate that if you want to score 7 points in vocabulary, you must have less common words and idomatic words. That is to say, you must have beautiful vocabulary and idiom expressions. But remember, this is not the same thing as the verbiage you mentioned. Less common words can be very simple. For example, when someone uses cheap to describe the advantages of taking the bus, and you use economical, then your vocabulary is less common.

The same goes for the second part. Connectives should be used, but they should be used naturally. Connectives should not be used just for the sake of saying connectives.

A score of 7 is a very difficult score for IELTS speaking. You need to practice more and refer to real questions. It is recommended that you understand the scoring criteria of the IELTS speaking test. I wish you success