Absolutely, those are all great suggestions for making a smart contract more secure. It's important to take every precaution to ensure that the code is as robust and resilient as possible, especially when it comes to handling sensitive financial transactions.

One additional measure you might consider implementing is multi-factor authentication (MFA) for key actions such as transferring tokens or changing ownership. This can add an extra layer of security and help prevent unauthorized access to the contract.

Another best practice is to keep your code simple and modular, with clear separation of concerns between different functions and components. By doing so, you can minimize the risk of unexpected interactions between different parts of the codebase that could lead to vulnerabilities or bugs.

Ultimately, creating a secure smart contract requires a combination of technical knowledge, attention to detail, and rigorous testing. But with careful planning and execution, it's certainly possible!