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Ah I get you. It could be down to your specific mobile deployment being somehow less-indexable than your desktop deployment (more common than you might think). I you can share a few URLs that rank on desktop but not on mobile at all, I (or someone else) will soon take a look at them for you!

This really depends on a number of different factors... How many pages does your site have in total? Removing 98 pages from a site that only has 100 would be pretty drastic. If your site has thousands of pages though, that 98 really isn't a whole lot. What's the quality of these 98 removed pages? If you're cleaning out thin/weak content, then removing these is likely a very good strategy. What's the topical focus of these 98 pages? If those 98 pages are random or irrelevant compared to the focus of your brand, then removing them may create less dilution of your main content. All in all, it really depends on the purpose of removal here and where it fits in your overall strategy. Hope that helps.

Not an SEO expert myself, but wouldn't suggest that. The backlinks you can purchase probably won't be of good quality, with little to no effect on your search rankings. In fact, they might actually have a negative impact if Google blacklists these websites you are getting paid links from. It appear you've exhausted many options trying to rank ahead of your competitor, but I think there are still a couple of opportunities you can consider: 1. Aim for "position zero" on SERP by optimizing for Featured Snippets 2. Optimize for image or voice search, rather than purely focusing on text results Hope this helps a little!