Try it though. If you want to start fresh you have to hit custom them unfollow each and every batch individually (there are a lot) and it's glitchy (the defaults can be different on each batch), so it's actually a LOT of work to unfollow everyone suggested.
Discussion
FRESH START? DELETE ACCOUNT. PROBLEM SOLVED. (NOT REALLY).
Sounds like teething issues, but I hear ya.
What's the alternative? Show someone an empty feed. Seems like a fine trade-off to make for me.
Yup, totally empty, but tons of content aimed at onboarding others you already know.
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