Every martial artist has the thing they enjoy the most. Some enjoy striking while some enjoy grappling, some enjoy doing kata while some enjoy sparring, some enjoy learning complicated, fancy techniques while some prefer to stick to what works. And all are absolutely valid and relevant.

It is also true that most martial artists, once they have a bit of experience, try to experiment with a variety of different styles to add to their repertoire, and eventually find the things that work or don't work for them, and this is a great thing.

Many systems put emphasis on the need to have a well-rounded skill set, and this is becoming more and more evident in sports like MMA. It is common to see the same people compete in a BJJ competition, a kickboxing competition and an MMA competition. When comparing the sport to what it was 20 years ago, it's also easy to see that just being good at one thing is hardly enough to be competitive at a high level today.

This also spills over to self-defence. Some people are natural strikers, while some people are natural grappler; and with the growing popularity of MMA the chances of facing attackers who have at least some training in fighting arts increases. Furthermore, we know that adrenal response will neutralise most skills that have to be actively though about. In other words, if you have to think through a process, you are highly unlikely to pull it off under stressful conditions. This means that if you find yourself in a position you have never been before, you are unlikely to react in an effective way under adrenal stress.
An example of this that has come up in recent conversations I've had was the whether or not studying BJJ is useful for Krav Maga students, as one of the first lessons in self defence is to avoid getting to the ground, and if you do get there to get back to your feet as quickly as possible. But the reality is, that if you have no experience on the ground, and do not understand transitions, positions and submissions, then if the first time you find yourself on the ground is during a street fight, you will not be able to pull off most of the moves you think you know. Again, does it mean you want to get the attacker to tap out? No. But it does mean that you should have enough of an understanding of it so that wherever you end up, it's nothing new.

Does this mean that in order to be a complete martial artist you must be a champion boxer, BJJ black belt and an Olympic wrestler?

Not at all!

But it does mean that you should probably get some exposure to all of these, with the idea that you know enough about how each style or discipline functions so that you can adapt your own style to match it and focus on what you're good at.

So what is the area that you are weakest at?

This question is the most hated one to ask ourselves, and yet the easiest to answer.

The answer is simple - whatever it is you hate doing the most, is probably the area you need the most work on.
And why do we hate asking ourselves this question? Because often it means shifting our training to the things that we are not good at, or don't enjoy as much. Especially for those who are already experienced in one area, going back to being a complete novice in another can be frustrating.

It is also good to remember that part of one's development in martial arts is to overcome adversity, build character and address problems with an open mind.
Working on those areas that we don't feel comfortable at or know need improvement is an important element of developing and growing as a martial artist and as a person.

Using my personal experience as an example, I found that when I spent time becoming more proficient at the things I didn't like doing, I noticed two things that happened; Firstly, I have become considerably less scared or anxious about doing them. In fact, some of those things have become quite enjoyable! Secondly, once I removed the negativity from my mind I was able to improve much more quickly.
I have found this to be the same with regards to certain elements in my career as well – instead of leaving those tasks I dreaded for the end of the day, or tomorrow, they are now the first things I do when I get into the office in the morning. As a result my productivity has almost doubled, and my stress levels have reduced!

Again, it doesn't mean doing those ALL the time FOREVER. But it does mean to you should do those things that you know you don't like doing from time to time.
And when you go back to doing what it is you're good at, you'll enjoy it more and be able to apply new ideas to it.