It sounds like you have part of your workflow in place already, but our Customer Tagger app allows you to both apply tags and then schedule those tags to be removed after a specified period of time, e.g. 35 days
If a Customer places another order within that time, we will cancel the existing scheduled tag removal job and create a new tag removal job for 35 days time.
A lot of Merchants use this feature to manage Customers with monthly subscriptions.
Unfortunately the wait action currently has a 30 days max limit on it. This means the OP wouldn't be able to use this for their particular scenario.
It's generally a bad idea to sleep/wait something for a long time like this as it leads to problems if you ever need to edit it. Instead, you can use scheduling to accomplish this. There is a template that shows how (for products) that you could adapt:
To outline the workflow steps:
order_date, see examples for how to use relative dates to get 35 days ago)
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