I don't have much advice on 'big' decisions (moving, house, kids, relationships, etc.). The techniques taught in Structured Decision-Making can be helpful for big stuff for some people.
However, one thing I would point out that decision fatigue is an ever-growing problem in today's world of options and abundance. There is a reason that Obama, with all the things on a president's plate every damn day, dressed in uniforms of similar clothes and had a very strict routine in terms of meals and exercise. He always said his goal was to have to spend as little time and thought on the non-crucial decisions he had to make every day, and save his time and energy for the inevitable big and thorny problems.
I also do a version of this, by implementing 2 main concepts:
1. I just don't buy much stuff. That way I have much less to decide. I am trying to get into minimalism more and more, and in some cases take purchasing things (esp things I don't need) off the table entirely. If I have an impulse to buy unneeded items, I force myself to wait a couple weeks and not research it. Often, after a couple weeks I no longer care. Or I remind myself that more stuff = more upkeep/cleaning/maintenance (e.g., fish tank = dumb idea).
2. Things that I do buy, I try to automate as much as possible. For example, If I find pants that fit and that I like, I buy 4 pairs so I don't have to think about it again for several more years. I buy mostly the same brands/types of products every time I go to the grocery store, and I have about 6 'fallback' meals that I default to over and over when I'm busy. I'm a big fan of 'good enough'...we have had cars we hated (Honda Accord P.O.S.), cars we were indifferent to (Nissan and Ford trucks), and cars we liked (Suburus). Sure, there could be some completely optimal car out there that we haven't found, but who cares? On the rare occasions we buy cars, we now buy new Suburus so we don't have to second guess that. We know we like 'em.
Most small decisions in life are not worth spending that much energy on. A few are, so make sure you keep the energy available for those.