Seeking a Simplified Approach for the Submit Button

I'm looking for a more straightforward method for implementing the submit button in PDF forms. The current process is confusing and involves multiple steps, which can be challenging for the average user. Specifically, users find it difficult to navigate through the various Acrobat steps required to attach and send the file.

Additionally, the form needs to ensure all required fields are filled before submission. Is there a way to streamline this process, possibly by having the user sign the form to make the fields read-only but not flattening them, because I have to use the filds to do some calcualitions later.

Could anyone suggest a more user-friendly approach or any tools and techniques that can simplify this process?

Thank you for your assistance!