Unfortunately you're still below the limit, you need to reach 7250 m/s at Mars level to succeed.
Your launcher is a good basis though. Its main drawback is that it only has 2 stages. By splitting the second stage that way, you can increase its performance:
View attachment 78295
=>
View attachment 78296
The configuration on the right can provide 209 m/s more. And 209 m/s at Earth level means much more at Mars level. This is normally enough, but to improve it a little more you can also make the first stage a bit shorter (just a bit!) and give the fuel to the second stage to compensate.
With a good flight trajectory, this should easily do the trick
Also don't forget that you can go up to 265 tons.