I recommend that you spend some time learning about the methods that already exist. This will give you a knowledge base from which to work. If you know what is already there and what is good, then you will be more capable of creating something that is both new and good. Thinking of something new isn't easy. With the creation of internet communities, many ideas have already been thought of and either developed or they have been dismissed as not good enough to be developed. It's fun to try to think of new ideas. But it's also important to thoroughly research and go over the idea to determine if it is new and if it is useful for the community.
2x2 methods especially are already really advanced. So if you are wanting to create a good 2x2 method, it may be difficult. For the methods that are currently being used, EG is still the most advanced. However, there other systems and methods that are even more advanced than EG. You can check out the A2 system, which is a way to take existing 2x2 methods into their various pseudo forms. In
this post I also detailed many other advanced 2x2 methods that haven't yet been developed. Those are the sibling methods of EG and many are likely the same speed and movecount as EG. So, look at those methods and what is on the wiki. Then you will have a starting point to think of something new that may be good.