Use a good matte finish once your paint is completely dry/cured. Remember to test on a "sample" like a button or something painted with the same paints you used on the figurine, to make sure the finish is to your liking (and see how many airbrush or spray can layers you need).
Haven't done this myself in years, and never with Nendoroids, but I used to use all sorts of lacquer, acrylic and/or enamel paints on models, depending on what we could get in South Africa at any given time, then just finish of with a good matte finish after letting the paint dry/cure for a few days.
Just remember you can paint enamel on top of acrylic and acrylic on top of laquer, but not the other way round (except for very, very careful, thin layers of lacquer airbrushed onto VERY well dried/cured paints). So I went looking around to see what the recommended way is - Seems they still do it that way.
There are quite a few good hobby sites, or you can google the specific figure you want to recreate and usually get a very good selection of advice, tutorials, YouTube videos, etc. fom people who have done it before. I picked the link below, because I figured if they're using these paints, tools and techniques to do commercial figurines for sale, it should work well enough, even if the blogger isn't a pro themselves.
See Kahotan's Blog at Goodsmile: https://mikatan.goodsmile.info/en/2013/02/27/final-painting-a-nendoroid-expression-part-10-adding-a-matte-and-blush/
(I've linked to the final instalment, as it shows the face before and after the use of a matte finish).
It goes from very shiny to quite a decent matte finish just from using the spray.
In the 10 part series of blog posts you see an amateur working with the same paints and tools used by the professionals to paint a Nendoroid face with helpful advice and inputs from the pros working around them. It also shows the paint brands (although I don't know if they are available outside Japan).