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According to this older HN posted article the way to slow down HFT strategies is get rid of the subpenny rule, such as pricing securities in increments of $0.0001

https://www.chrisstucchio.com/blog/2012/hft_whats_broken.htm...

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I'm not sure that this would slow down HFT, but it might cut costs for consumers. It would definitely be a good idea to have different tick sizes for different products as it's odd that the most liquid products and the least liquid products might both have a 0.5bps tick size in the US.

If you do reduce the tick size you'll need to make some changes to internalization to reduce the toxicity of lit venues.

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