What is the right way to use service methods in Django?

As an example, let's say I am building an Rest API using Django Rest Framework. Now as part of the application, a few methods are common across all views. My approach is that in the root directory, I have created a services.py file. Inside that module, is a class (CommonUtils) containing all the common utility methods. In that same services.py module I have instantiated an object of CommonUtils.

Now across the application, in the different views.py files I am importing the object from the module and calling the methods on that object. So, essentially I am using a singleton object for the common utility methods.

I feel like this is not a good design approach. So, I want to get an explanation for why this approach is not a good idea and What would the best practice or best approach to achieve the same thing, i.e use a set of common utility methods across all views.py files.

Thanks in advance.