For example by running i'm getting 75 agility per second, or by mining dirt 187 excavation xp, is it supposed to be this way?

Yes, this is normal. You can change it if you like, but this is the default settings.

thank you, how can i change it? in 1.21 version

minecraft/saves/<save name>/serverconfig/pmmo-server.toml

Edit the following to a lower value. Do so with the game closed and with any editor except Notepad++.

            [XP_Gains.Event_XP_Specifics.Player_Actions."SPRINTING Skills and Ratios"]
                agility = 100.0

For excavation you would be better served with a general scaling down of XP.
In the same file, find:

	#Modifies xp gains for specific skills.  This is multiplicative to the XP.
	#(Mutually Exclusive to [Global Modifier])
	[Levels."Skill Modifiers"]
		example_skill = 1.0

And make it:

	#Modifies xp gains for specific skills.  This is multiplicative to the XP.
	#(Mutually Exclusive to [Global Modifier])
	[Levels."Skill Modifiers"]
		example_skill = 1.0
		excavation = 0.5

This would halve excavation XP

Ah! Yes, you need to generate a datapack with the configs.

In game, type the following in sequence:
/pmmo genData begin
/pmmo genData withConfig
/pmmo genData create

This will make your files in:
minecraft/saves/<save name>/datapacks/generated_pack/data/pmmo/config/server.json
The is the section you want. You can modify endurance and agility in there:

  "levels": {
    "xp_min": 200,
    "xp_base": 1.025,
    "per_level": 1.1,
    "global_modifier": 1.0,
    "skill_modifiers": {
      "example_skill": 1.0
    },
    "loss_on_death": 0.05,
    "lose_on_death": false,
    "lose_only_excess": true,
    "max_level": 1523,
    "static_levels": [
      -1
    ]
  },

Making these changes:

  "levels": {
    "xp_min": 200,
    "xp_base": 1.025,
    "per_level": 1.1,
    "global_modifier": 1.0,
    "skill_modifiers": {
      "example_skill": 1.0,
      "endurance": 0.5,
      "agility": 0.5
    },
    "loss_on_death": 0.05,
    "lose_on_death": false,
    "lose_only_excess": true,
    "max_level": 1523,
    "static_levels": [
      -1
    ]
  },

This will halve both (multiply by 0.5).

in 1.21 you have to generate them. use the /pmmo genData withConfig command followed by /pmmo genData create to construct the datapack with the configs included. you can then edit from there.

minecraft/saves/<save name>/serverconfig/pmmo-server.toml

Edit the following to a lower value. Do so with the game closed and with any editor except Notepad++.

            [XP_Gains.Event_XP_Specifics.Player_Actions."SPRINTING Skills and Ratios"]
                agility = 100.0

For excavation you would be better served with a general scaling down of XP. In the same file, find:

	#Modifies xp gains for specific skills.  This is multiplicative to the XP.
	#(Mutually Exclusive to [Global Modifier])
	[Levels."Skill Modifiers"]
		example_skill = 1.0

And make it:

	#Modifies xp gains for specific skills.  This is multiplicative to the XP.
	#(Mutually Exclusive to [Global Modifier])
	[Levels."Skill Modifiers"]
		example_skill = 1.0
		excavation = 0.5

This would halve excavation XP

in 1.20.1 i found configs in folder you mentioned, but in 1.21 i cant find them here

thank you very much!