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From the shoesnob product page for a sude brush (out of stock sadly):
"Suede can be a tricky material to maintain and there are not a lot of products that can be used to do so. The key is to minimise the amount of dust/dirt that will embed itself into the hairs of the suede which will eventually matte it down and fade its colour. Sometimes you will not notice it happening until it is too late. The suede bristle brush will help to prevent this and keep the nap of the suede clean and healthy looking. Simply steam (with your iron or kettle – 6 inches away) and brush it down every other time you wear your suede shoes to ensure a long lasting life."
https://www.theshoesnob.com/collections/shoe-brushes/products/suede-brush
That said, i wonder if brass bristles are a little harsh - I use a crepe brush on my suede shoes
I picked up a pair of these https://www.harrysoflondon.com/basel-4-kudu-suede-grey
for fifteen quid on ebay. Surprisingly good condition but could probably do with a bit of a perk up. Any tips for suede?