Find and submit the shells, heads, cymbals, hardware, drumsticks, pianos, keyboards, synths, microphones, software, studio equipment, headphones, DAW & software, plugins, and other instruments used by Dextro.
If the artist is active on social media, check places like their Instagram feed and look for musical equipment they can be seen using.
You should also do a Google image search for things like "Dextro studio" and "Dextro live" and spot gear that way.