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First thing I would suggest is getting your business address in the footer somewhere.

Find out more about this service - change the link to Find out more about our TomTom repair services

Those were the first two things I would suggest with out going into research.

I’m a fan of how apple organizes their products.  80 products in a category, shouldn't give you a problem with too many on page links.

If you have subcategory overlap, make sure you have canonicalization to avoid duplicate content.

If you need to paginate put the most important products first

Here's an article about optimizing your page speed