Star Trek: Discovery had a fatal flaw that doomed it from the start, the creators of the show thought it would be a good idea to stick a new IP right before the events of Star Trek: The Original Series, and a bit after Star Trek: Enterprise. In theory, a fine idea, in execution, they fumbled the bag severely. By doing this, they set an expectation among the fandom. We know or knew what certain things would or should happen and we went forward accordingly.
Then they decided that just about everything knew about Star Trek following Enterprise and predating The Original Series wasn't good enough and they made grand sweeping changes. Spock's linage, the design of the Klingons, the advancement in technology that was lightyears ahead of anything we had ever seen before; it felt like the showrunners were creating the show to win online debates.
Not creating a show that would cater to fan expectations. It was the main reason why fans rejected the franchise, as they went too far in changing established lore for their own desire. Changes that on the whole weren't bad ideas, but when they did it in the timeline angered a lot of fans. Had they set the show in a different era, at a different point in time, this wouldn't have been an issue. The decision to shoehorn the show into this era was made to remake Star Trek in their own image, and it failed.
It's why Discovery ultimately failed, and we have a few ideas for how they could've avoided being the worst-received Star Trek show of all time.