Are you going to get any better, or is this it?

What are you doing to improve your technical skills?

What are you doing to improve your tactics?

What are you doing to improve your footwork?

What are you doing to improve your fitness? Ahh, dirty word, right?

How do you practice?

Do you practice?

Are you too good to take a lesson?

I know, the word "lesson" is a slur to most 4.0 and above players. That is why you will stay at "that" level and lose to those below that level.

How about the word "train"?
Is that better?

Do you believe you cannot get any better? Well, stop that negative thinking.

Let's look at the players you look up to. Federer, Nadal, Serena, Venus, Sampras, Navratolova, Agassi, Henin, Hy (just checking if you are still reading)

Do you think they just showed up at the US Open with a water bottle in hand and won?

All those players above train, practice, "take a lesson", have someone take a look at them playing to make sure footwork, bodywork and racket work is up to par.

When you step up to that center mark to deliver your serve or send back a return, will you be up to par?

Find a pro.
Book a training session.

It's time to get better.

It's never too late.