For stuff like this I usually start by searching for YouTube videos:
There were about a million more from the usual suspects: Jenna Moreci, Abbie Emmons, etc. but I imagine they all say the same thing, more or less.
Next I’d try googling for writing advice blogs and podcasts maybe if those videos don’t help…? ¯\_(ﭢ)_/¯
Anyway, good luck! Getting the pacing of a book just right is hard. I find the best way is to let it sit awhile after it’s done, then read it though like a real reader would, marking all the places where it gets slow or boring, then tweaking those. __〆(．．)