When you have a DNA Match with a User Name “kgeng45” and no Family Tree there is not a lot you can do other than look at the Shared Matches too see if their is any divine intervention likely to happen.
K Geng b1945 reports Zero records in Ancestry.
I have had success in resolving a few odd usernames for DNA matches, via internet searches for the same name.
In one case an Ancestry match used the same username for a pinterest account, and information that I found there allowed me to also discover her Facebook account and piece together her name and location. I discovered that she was a 3rd cousin.
In your case, there is a "kgeng45" who is an active member of the Pearl Jam Community forum since 2018. His image suggests that he is a lot younger than someone born in 1945, so the "handle" is probably not connected to his year of birth. Not a lot to be gleaned there unfortunately, other than that he is probably located in the USA, but there was also a user "@kgeng45" on Twitter, who could well be the same person. His name is shown as Kyle Gendreau. The Twitter account was active in 2015 but appears to no longer exist.
There is a Kyle Gendreau from USA who is a company director of Samsonite - the luggage manufacturer. He was previously a director of Tumi(UK) Ltd, and the Companies House record indicates that he was born in May 1969. Several previous officers for Tumi(UK) appear to have had connections to Samsonite.
Kyle Francis Gendreau is currently the CEO of Samsonite. There is more information under his profile on the following link:
https://corporate.samsonite.com/en/senior-management.htmlThere are 6 Kyle Gendreau profiles on LinkedIn. From photos linked to the "kgeng45" accounts mentioned above, it looks like the Samsonite CEO may not be the best match, and "Kyle G." on LinkedIn, from New York and linked to Epsilon Technologies Group could be a better fit.
There may be more to find, the above is just a result of 5 minutes searching on my part.
There are 2 Kyle Gendreaus on Ancestry.