Yahweh compares the way that he made a boundary for the sea to containing the sea with bars and doors. AT: "I set up its barriers" (See: [[rc://en/ta/man/translate/figs-metaphor]])
The words "this far" mean only as far as the boundary that Yahweh set up. AT: "You may come as far as this boundary, but no farther" (See: [[rc://en/ta/man/translate/figs-explicit]])
"to the power of your waves." The waves are spoken of as if they could have pride. The abstract noun "pride" can be translated as the adjective "proud." AT: "to your proud waves" or "to your powerful waves" (See: [[rc://en/ta/man/translate/figs-personification]] and [[rc://en/ta/man/translate/figs-abstractnouns]])