in addition to what others are saying (seriously 145k is too long), The Essential Guide to Getting Your Book Published is about 20 years old it looks like. much of the advice may be outdated. publishing and querying has changed a lot in the last few years, particularly after the pandemic. so i would suggest focusing on more current advice.

this template and this doc can help you get the pieces in order.

I know it's epic fantasy. But 145k is going to earn you rejections on length alone.

I have a feeling The Lost War is self-published (i.e. published by King Lot, of whom Justin Anderson is the sole director), so not the ideal comp.

The fledgling Kingdom of Aepheria began not fifty years ago with the promise to bring peace and order to all manner of creatures. Now, cracks have started to show. Not that twenty-year-old Jack Twinley notices until he encounters a fairy trapped by a hungry house cat.

'When Jack Twinley rescues a fairy from a hungry house cat...'

This worldbuilding isn't unique enough to be a hook in itself, so cut to the chase. What does Jack do? You could add a word to the above to make it clear we're in a fantasy world; at first I read this as him existing in the real world, and this as a portal fantasy setup.

Saving the fairy, she rewards his act of mercy by revealing the tremendous elemental powers hidden within him. And when he uses those powers to save an injured soldier, it becomes clear that he may be meant for more. To discover just what that might be, Jack joins with a gallant soldier and noble-turned thief to travel to the Mages’ Guild in the city of Palamount. Finding the guild closed and aimless for next steps, the trio agree to escort a dishonest dwarf through the enchanted forest of the Eldwood, where they meet an all too naive half-elf and are pulled into the struggle between the elves of the forest and the dwarves to the east.

'...she rewards him by revealing the tremendous elemental powers hidden within him.'

Jack realises he has magical powers, and travels to the magical guild for help. They can't help. I'm not sure I see how him escorting 'a dishonest dwarf' is a natural narrative consequence. What does he want, and why, and why can't he get it?

Especially because...

Only together with his companions can Jack survive the journey to the Dwarven city of Greyrock, where they must act as spies for elves to stave off the coming Dwarvish attack. Yet Greyrock is in turmoil under the iron grip of dread general Pavor. And if the heroes fail to navigate the city’s darker side and sabotage Pavor’s plans, the Eldwood and the countless beings who seek its protection will be lost in the battle to come.

...you're now in full epic fantasy mode, elves and dwarves and a dark lord, with very little sense either of character or even of plot cohesion.

Why is Jack doing this?

To add to injury, epic fantasy is not a popular (ie: to the extent that a new career can be launched from it) genre at the moment. it peaked around 5-6 years ago with the GoT series and the big epic fantasy boom of the 2010s, but post-pandemic fiction is leaning very much into very character-driven works. (Romance/romantasy, horror, cosy, historical).

Classic DnD trope fiction probably peaked even earlier.

It's going to be a hard sell up the chain for the agent/acquisitions editor who only has a set number of books they can work with a year, and the machinery of marketing and reader interest is very cool on traditionally published epic fantasy at the moment. If it's not the wordcount knocking you back, your genre is also a difficult one.

Don't consider it a bust if you need to shelve this project for fairer weather and a return to epic interest.

It's likely that no one even read your query. 145k words is too long for a debut novel. Most agents will auto reject anything over 120k, especially epic fantasy which tends to be bloated. And neither of your comps works. The Red Knight is too old and The Lost War is self-published. You need two traditionally published novels from the past five years that are popular but not household names and that have at least one interesting point of comparison with your story. From an agent's perspective, bad comps make it look like you don't read very much and aren't aware of current trends and audience appetites.

Is this your first novel?

As far as the query itself, never start with worldbuilding. Always start with character and stakes.

We get very little reason to care about Jack in this query or any sense of what Jack himself cares about. The opening line teases cracks in the kingdom, but these never come up again and Jack has nothing to do with them. The rest of the query reads like a simplified synopsis. You want your first paragraph to focus on introducing a unique character, stakes, and circumstances in which those stakes exist. Paragraph two should hit the inciting incident and what propels the story forward. Paragraph three then teases what the story will ultimately be about. I don't really get any of this in any of the paragraphs you have here.

I think you should go back to the drawing board on the query, trying to highlight the most unique elements of the story and focus on a throughline that emphasizes those elements.