If you want a deeper keyboard sound, these are the switches and keyboard traits worth prioritizing first.
A thocky keyboard usually combines a deeper bottom-out sound, a cleaner acoustic profile, and less high-pitched ping. The switch matters, but it is only one part of the result. Plate material, foam, case design, keycaps, and even small changes like rubber keyboard feet all shape the final sound.
If you want the fastest path to a better result, start with the switch, then look at the board and mounting style. Linear switches like Gateron Ink Black V2 and Oil Kings are common starting points, but tactile switches like Holy Panda and Boba U4T can still deliver a thocky keyboard when the rest of the build supports them.

One of the smoothest stock linear switches if you want a deep, polished sound without a huge modding session.

A classic enthusiast linear that still shows up in many of the best thocky switch recommendations.

The go-to tactile pick when you want a thockier sound profile without going fully linear.

Still one of the best-known tactile switches for a punchy sound and a premium, dramatic bump.
The best thocky keyboards do not rely on switches alone. You also want a board with better case acoustics, room for foam, and a layout that matches how you type every day.
If you are still deciding on switch feel first, read Best Linear Switches, Best Tactile Switches, and Linear vs Tactile Switches.