The Daily Dose of Hebrew and the Daily Dose of Aramaic went over Psalm 5:8 (verse 7 in the English) about half a year apart, but in this post, I'm combining minor points I noticed from each time.
וַאֲנִי בְּרֹב חַסְדְּךָ אָבוֹא בֵיתֶךָ אֶשְׁתַּחֲוֶה אֶל־הֵֽיכַל־קָדְשְׁךָ בְּיִרְאָתֶֽךָ׃But as for me, I will come into Your house in the multitude of Your mercy; in fear of You I will worship toward Your holy temple. [NKJV]
In referencing other translations, I found a couple in which בְּרֹב חַסְדְּךָ is rendered as an alliterative phrase (even more concentrated than the NKJV's "in the multitude of Your mercy") and realized that the repetition involved in this alliteration provides a slight sense of this abundance.
"große Güte" ("great goodness") in German (in which this is also verse 8):
Ich aber darf in dein Haus gehen durch deine große Güte und anbeten vor deinem heiligen Tempel in deiner Furcht.
"multitudine misericordiae" ("multitude of mercy") in Latin (also verse 8):
ego autem in multitudine misericordiae tuae introibo in domum tuam adorabo ad templum sanctum tuum in timore tuo
Additionally, the high number of syllables (eleven) in the phrase "multitudine misericordiae" hints at this great amount, especially in contrast to the surrounding words, which have only one or two each.
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In a way, the placement of the phrase בְּרֹב חַסְדְּךָ before the verb אָבוֹא (rendered as "I, through the abundance of your steadfast love, will enter..." in the ESV) indicates that receiving God's steadfast love necessarily precedes entering His house. I wouldn't usually use word order as the basis for an argument, but what the Psalmist describes here seems analogous to Luther's explanation of the third article of the Apostles' Creed: "By nature I am spiritually blind, dead, and an enemy of God, as the Scriptures teach; therefore, 'I cannot by my own reason or strength believe in Jesus Christ, my Lord, or come to Him'" therefore "The Holy Spirit 'has called me by the Gospel,' that is, He has invited and drawn me by the Gospel to partake of the spiritual blessings that are mine in Christ." Likewise, without the invitation of God's steadfast love, the Psalmist would remain outside, with "the boastful," "all evildoers," "those who speak lies," and "the bloodthirsty and deceitful man" in the preceding verses.