Hey again wannabeamama!
I personally would be a bit wary of Keto as it can throw your hormones off balance and it is not recommended to be in a physical state of ketosis when trying to get pregnant or while pregnant in general, but from a google search it seems like critics are torn on the benefits vs risks of Keto. But with most things, why chance it though right?
I'm personally on a mediterranean type diet, lots of greens, veg and fruit, beans and lentils, some chicken and low mercury fish but largely veggie based with lots of healthy fats and some whole grains. So for me, more of a lifestyle change in making healthier, generally more plant based, choices over time as opposed to a fad diet i knew i wouldn't stick to long term, helped me to drop a bit of weight before starting fertility treatments. I went from 165lbs down to 135lbs over the course of a year doing this and gained muscle/lost some fat. Not drinking alcohol probably played a role in losing some unhealthy belly fat as well. I'm also not a die hard, like if i am really craving some red meat or some kind of white carbs or treats then i have it. life is too short and everything should be in moderation, EVEN moderation. all about balance i think.
BUT everyone's body is different and with different needs, so i definitely second what Ak84 said above, maybe a holistic practitioner or a dietician with experience in fertility could help get you set up for success?
Also keep in mind dropping weight quickly probably isn't conducive to pregnancy, so definitely take it slow and steady. Best of luck to you!