The Op Lich is a Returnee – Stuart Grosse

This is a serialized novel, with a 100-or-so-page installment coming out every three months. The premise is entertaining and well thought out: It starts with an isekai trope - ordinary youngsters from Earth summoned magically to another world to be heroes - except that people who are kidnapped in order to become cannon fodder are not always going to be grateful. At the start of the first installment, the surviving hero returns to Earth - leaving behind a great deal of chaos and destruction. Now she is back, with a destabilizing amount of magic knowledge and power.

She is willing to share her knowledge, if gradually. In fact, and to the detriment of the writing, most of the word count seems to consist of the protagonist lecturing people about magic. I did, in fact, read several installments past the first. It reads well enough, but the exposition overwhelms the plot. The plot itself is wish-fulfillment-heavy. People who attack the protagonist, or try to spy on the protagonist, or just plain annoy her, seem to have a hard time learning that once an arch-mage waves her hand, it’s over.