Along the Razor’s Edge, is the first in The War Eternal series from Rob Hayes, a self published author of award winning fantasy novels. If you want to learn about pacing verses tension, there’s plenty to explore in this.
You can also catch my review of Along the Razor’s Edge in the most recent edition of the British Science Fiction Association Review. Normally BSFA Review is released to members only but is offered free to download during the Covid-19 lockdown in England. There’s plenty of other superb books reviewed there too.