8
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  1. Any proficient ability check d20 roll of lower than 10 is set to 10 with the Reliable Talent rogue feature.
  2. +17 from the Expertise rogue feature (12 + ability modifier of +5).
  3. +a minimum of 1 from the guidance cantrip.
  4. +5 from the Flash of Genius artificer feature with 20 Int:

    Flash of Genius

    Starting at 7th level, you gain the ability to come up with solutions under pressure. When you or another creature you can see within 30 feet of you makes an ability check or a saving throw, you can use your reaction to add your Intelligence modifier to the Roll.

    You can use this feature a number of times equal to your Intelligence modifier (minimum of once). You regain all expended uses when you finish a long rest.

= 33? Am I stacking these right?

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Yes

You've done all the math and that's correct. Of course, you need to be using a skill check in which you're proficient, but you are a 20th level PC and built it in such a way to maximize the skill check possibilities.

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