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You have mostly MX blue switches. It is possible for one or two on a keyboard to have a different or muted click - I have a Ducky Shine that had a similar problem.
You can totally mash the key - press it thousands of times to loosen the internal bits somewhat. That approach worked for me.
Or you can replace the switch with a known working switch. That is a lot more work and involves desoldering the old switch and soldering a new switch in. Made slightly easier for you as the DAS does not have backlighting.
Or you could ask your supplier if they would exchange it if it is still under warranty as a couple of switches don't click, although they will probably refuse as the switches actually work, they just don't click.
You might have a MX green switch under the space bar. Both of my Ducky Shines with MX blues have an MX green under the space bar. MX greens click like blues, but are much stiffer.
If you really want to replace the spring, you'd almost certainly have to desolder the switches as you cannot remove the switch top with the plate, so you' need to remove the switch completely from the board. In that case you might as well replace the whole switch with something more to your liking.
