Google ads improvement

I run a very niche business and most of my clients come via on Google ad campaign that I have been running for over 2 years. I use a small list of specific keywords. This has worked very well for me however recently I have noticed that my share impression and clicks per day have dropped dramitically and I don't know the reason for this.

I am looking for someone who can analyse the current health of my Google ad and look for ways to improve it and outrank my competitors.