What is a good number range of influencers to include in a shortlist for an effective campaign?

For different campaigns with similar objectives, is it recommended to reuse the same influencer shortlists or should these be created afresh?

Is there a method for keeping track of influencers that have been previously shortlisted for campaigns, for future reference?

While shortlisting influencers, on what parameters should I evaluate their fit for my campaign?

When I’m starting a new influencer campaign, what strategies can I use to create an effective shortlist of potential influencers?