Add-on without full checking

Hello Colleagues,
We use the add-on as addition decision for Salesforce. Our add-on is intended only for our clients and not useful to other users.
Can you give an answer? what type of test we need to choose to accelerate the verification process. Since we have a lot of constant improvements and updates of the add-on.
so that our customers spend minimal time waiting to update their plug-ins
Thank You!

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