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Could be an air bubble trapped somewhere. Hold the bike up in front of you and bounce it up nd down on the rear tyre whilst pulling and releasing the lever.
Any trapped air bubble will make its way to the reservoir at the top of the system and brake should instantly feel better.
Finally, Bleed brake to remove air bubble.
MTB-Idle
I was alway under the impression that Shimano road levers and MTB calipers were compatible? I've setup some GRX-400 levers with some old(ish) single pot SLX. They sort of work, but even after a fresh bleed the lever pulls to the bar and they're not very powerful at all. Am I missing something with different lever throws, or something?