We offer our Premium Members one Query Letter Review per year of membership. You can find this under My Jericho > Expert Member Advice, which you can also reach at this link: Expert Member Advice – Jericho Writers.
To make the most of this service, I'd recommend polishing your query letter as much as possible beforehand, which these resources can help with:
Read A Sample Literary Agent Query Letter, With Hints & Tips
Our Query Letter Builder in The Jericho Writers Vault
Query Letter Masterclass with Silé Edwards
Build a Winning Query Letter with Becca Day