Regarding Link Detox, links it diagnoses as Toxic are generally fine as they're either not indexed by Google or have malware/viruses/etc., but I recommend a manual review of any diagnosed as Suspicious. I used it recently to get started cleaning up our backlinks and some legit sites and blogs were under Suspicious simply because they didn't have many links pointing to them.
Google Analytics is free to use, and the insights gleaned from it can help you to drive further traffic to your website. Use tracked links for your marketing campaigns and regularly check your website analytics. This will enable you to identify which strategies and types of content work, which ones need improvement, and which ones you should not waste your time on.
For our client: We monitored everything on a daily basis. If something came up, which needed to be fixed, we were quick to implement it with the development team at the business. We also rolled out numerous campaigns multiple times as they worked effectively the first time around in generating significant traffic so it was second nature to do the same thing twice.
free website traffic generator software