Monthly goals are usually set using projects. Projects mean any tasks that require more than 3 steps to complete. Take a look at your old goals and you will find many such examples. Let's say "Site creation". First, you need to make a list of similar projects.
Then arrange them in priority order. The most important tasks should be at the top, the least important at the bottom. Try to identify no more than five projects you want to tackle in the next six months. Break them down into basic steps, indicating the weeks and months when they should be completed.
After that, move on to fleshing out each goal. Try to describe each moment in as much detail as possible. This will not only make it easier to accomplish your tasks in the future, but also give you a better understanding of what needs to be done. Remember that by correctly defining your goals for the month, you are much closer to the desired result.
Consult with your colleagues or business partners. They can remind you of the challenges you faced in the past or that can help you succeed. Try to listen to the opinions of the people around you more often, since they are the ones around you most of the time.