Solved problems don't necessarily stay solved. Often, they are the source of new problem. Changing conditions can also affect the durability of a solution to a problem. So, a problem solver cannot expect to solve and forget. They must watch the problem to see if it is truly solved by the solution after it is implemented.
Sometime, solving a problem does not necessarily give us what we want. To get what we want may required a goal setting process, and ultimately, a selection of a few goals from an endless set of possibilities.
Rapid change can be the source of new problems as well as the source of new opportunities. Both change and problems can be the source of opportunities. Until you had a problem, you might not have noticed that there were possibilities for improving your current situation. Thus, besides just wanting to regain something that was lost by solving a problem, you may now want to move to a new future state instead that is better than what what previously existed. In that case, you will be applying a blend of problem-solving and decision-making. First, you will decide what future state you prefer from amongst all that are possible. Then, you will develop an implementation plan to create that future state. If there are roadblocks (problems) that would prevent you from achieving the future state, you would explore the causes preventing it and follow the process suggested in that section of the web.