Just so you know, you put accidentally put the Spells as 19 instead of 9.
As for card choices, I hear that these days hand traps are the hot topic given how much first turn Link spammery occurs. To my understanding the hot items are the Ghost Girl series, so Ghost Ogre & Snow Rabbit, and Ash Blossom & Joyous Spring. Ghost Reaper & Winter Cherries might also be useful if you aren't really all that fond of an Extra Deck, so you could use her alongside ED staples to shut your opponent down.
With that said you could sub out the D. Prisons in favour of the Ghost Girls, as well as subbing out those 2 empty trap slots. If you do like your traps though you could make use of Solemn Warning's younger sibling Solemn Strike, which basically does similar work with the added plus of screwing over other hand traps. If you don't like playing in the Link Era you could definitely also use Dimensional Barrier, which is good for shutting down mono-type EDs like Frightfurs and most Zoodiacs.
Other than that, your deck looks pretty standard for Volcanics.
Oh yeah, there are a lot better choices than MST now, with the likes of Twin Twisters, Galaxy Cyclone, and Cosmic Cyclone now existing. Cosmic can be pretty good considering that a lot of backrow nowadays love to be destroyed by card effects, but still hate banishing. So it cockblocks those sorts of cards while still getting rid of them.