Then leave it as-is. There's nothing you've mentioned in this thread that's a problem. As mentioned before, SQL will use all memory that it's allowed to use. This is expected, documented behaviour and it's a good thing.
Now, you may have it using a little too much and risking starving the OS. You probably want to lower max server memory if it's set to a non-default value. If it's set at default still, you definitely want to change it. See chapter 4 of https://www.red-gate.com/community/books/accidental-dba
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability
We walk in the dark places no others will enter
We stand on the bridge and no one may pass