Research to Find Websites Suitable for Guest Posts

We're looking for someone to help us with the research to find suitable websites for our linkbuilding projects, which primarily focus on placing Guest Posts.

We require somebody with experience of using targetted searches on the main search engines, as well as any other tools such as Ahrefs, SEMrush etc. to find blog and content websites in particular niches, against key criteria for location (mainly UK and US), authority (DA and DR), and also monthly traffic levels.

We're looking to train up internally to do this in the medium to long term, but for now, we need assistance from someone who is already up to speed with how to source these guest post opportunities at scale.

Thanks for your time and let me know if you have any questions.