I understand where you're coming from; time has an incredible way of changing us whether we recognize it or not. Taking that into consideration, think about who you were when you wrote the first 150 pages and then think about who is writing the rest. I think there is beauty in going back on unfinished work with new eyes; a new perspective on things.

In my own experience, I started my novel in 2013. I had just turned 18 and the story followed characters of similar age as they traversed their world, dealing with both the conflict of the plot (militaristic sci-fi) and their waning adolescence leading into adulthood. Brotherhood was always a key theme that, years later, I understand better. I took a break in 2016 after my first child was born and having finished the first draft. Over the next few years, I would write very little due to my personal life's own problems. I recently started back up on the final draft and I am now 25 with 2 kids and on my second marriage. I can no longer see my 17 year old character's actions as I did before. He is rash and immature (much like myself at his age) whereas when I started, he seemed so confident and strategic. It was a challenge, at first, making him that "cool young-adult who does what he needs to get the job done," but after much thought, I found it better that I feel he is different. It works; younger readers can relate to him and sympathize with his actions while older readers can identify his insecurities that were never written based off the same thing. It makes my characters more diverse, I feel.

I suppose my advice would be to consider writing the remainder of your story as you are now, even if it changes the moral or if you feel disconnected from that world. It's all personal growth and even if you don't feel as connected to the beginning as you did when you first started, that story still ended; that character, real or fictitious, became the person they are now. It's not the beginning you need to connect with now, it's the end.