I see a death by a thousand cuts, probably a direction of play defect from the beginning?
Any comments welcome.
I won’t comment on every move, just on this position because your attacking method looks wrong. If you observe the board,
- The white group X is very strong
- Black’s triangled group is weak
- White’s squared group is weak.
So you want to attack Black group. To do so, don’t attach like you did, this violates the proverb not to attach to weak stones. Attack from a distance, for instance by jumping at C8. This way,
- you help your weakest group
- you start building points on the left side
- you indirectly help your stone C14
- Black is under pressure, as the group is still without eyes.
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Or just directly capture the cutting stones with e5. 
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You mean a dumpling?
These stones are helping a lot
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I made a mini review of a couple of ideas. I can add some more if needed.
I think once black had the corners fairly solid, and a few points lead it was hard to make up the territory on the sides and centre later in the game in the end.
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Thank you, I will read it carefully. 
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