I am all ears. What does it mean?
I find backing back to Revelation 9:4-6 that the figurative tormenting locusts plague is directed to harm only those without the Seal of God meaning those of Christendom whose very long record exposes them to be part of the false MANY of Matthew 7:21-23.
Often in Christendom ( so-called Christian ) we find both believing and Non-believing members.
Their religious leaders are the 'blind leading the blind' of Matthew 15:14.
As for 5 months that is the normal or usual life span of those locusts, so as long as those figurative locusts live they have stinging messages for enemies of God ( the truth of the Bible torments them ).
The anti-God clergy of 2 Thessalonians 2:2-8 who sit themselves in the ' temple ' (houses of worship) as if they are God when in reality they are anti-God. They are like the un-faithful of Jeremiah 8:3.
Their religious lies are now exposed, and their death-like spiritual state is now seen.
Their religious ' waters ' (their people) are now drying up spiritually.
The four angels ' kill ' in exposing Christendom's spiritually dead condition, and ' get out of her ' - Revelation 18:4.
Both the angels and the locusts like horses of cavalry with heads like lions tied to THE courageous Lion ( Jesus ) of the tribe of Judah and are involved in theocratic or heavenly warfare. They have 'symbolic' destructive fire, smoke, sulfur power. Symbolic because it is just the executional words from Jesus' mouth according to Isaiah 11:3-4; Revelation 19:14-16 that will bring an end to the wicked. Until that time, fiery-adverse judgement messages goes forth to those playing false to God and His Word.