Passage
Bless the LORD, all his works in all places of his dominion: bless the LORD, O my soul.
Bless the LORD, all his works in all places of his dominion: bless the LORD, O my soul.
Psalms 103:20 Bless the LORD, ye his angels, that excel in strength, that do his commandments, hearkening unto the voice of his word.
Psalms 103:21 Bless ye the LORD, all ye his hosts; ye ministers of his, that do his pleasure.
Psalms 103:22 Bless the LORD, all his works in all places of his dominion: bless the LORD, O my soul.
The verse centers on "bless", "lord", "works", "places", "dominion", and "soul". It is saying that the verse draws attention to "bless" and "lord", so its meaning should be read from those terms before moving to application.
The prior verse says "Bless ye the LORD all ye his...", giving immediate footing for "bless" and "lord". In Psalms context, the local focus is worship, trust, the LORD's kingship, and covenant mercy.
A plain takeaway is to answer the verse's own emphasis on "bless" and "lord" with trust shaped by these words, not by a vague optimism outside the passage.