To get the big picture right, pick up a good book on strategy. I highly recommend reading Good strategy bad strategy. It might not seem applicable to marketing directly but it will help you put together a strategic framework you can use to solve any problem and how to think strategically.

Once you have done that, put together all the high level questions you need to figure out in a doc: What problem are we solving? Who are we selling to? Are they looking for something like this or do we need to educate them about this product? What triggers/events lead them to look for something like this? Why are they buying from us? Where do they go when they are looking to buy something like this?

Once you have put these larger questions down, your day to day will help you figure these questions out and the more clarity you have on them, the more you will be able to focus on doing the right things instead of just doing a lot of things marketing blogs might ask you to do.