I work with a lot of clients (especially now that COVID-19 is a big thing) who cannot understand my recommendation that their site needs to be reworked, fixed or altogether redone. They're pressing for more and more marketing ads, but don't realize that they'll never get proper conversions. When I explain this to them - how they must optimize and even do proper UX testing before they can expect conversions - they nine times out of 10 will shut down and just demand more ads.
What strong options exist (in the way of methodology or tools) to help convince website owners that they need to design adjustments or reworks or altogether new websites when they don't seem to want to listen?
Some tools such as GTmetrix have helped from time to time to convince folks "your site really sucks", but other than that I've not hit upon any solid tools that really go the extra mile in this regard. Just simple logic and experience, even when you've 20+ years behind you, don't help folks to appreciate your wisdom either unless you have some data to back you up that specifically pertains to their situation.