Hashicorp Vault is always my goto even for small companies. It seems too much but it’s really not. A single instance is scalable enough to handle quite a bit of traffic.
Another good alternative if you need something more SAASy is the 1pass API product
I felt the same but it was too hard to find people that knew how to operate Vault and so we abandoned it since it was too risky to have such a critical part of our infra without an abundance of talent out there.
Another good alternative if you need something more SAASy is the 1pass API product