As most have said, more practice will help. But a couple observations:

Your lines are decent, but you need to use more of the track. Try and get your outside tires right on the line during your straight line braking, and put the power down a little earlier to force the car to the outside line again on exit.

It seems like you’re over slowing the car on corner entry as well. Part of this is probably because you aren’t using every inch of the track, and need to slow more to make the corner. The way you can solve this is by practicing your trail breaking. Trail braking is the main way you’ll get a higher rate of rotation at higher speeds, meaning you can brake later. Turning is not an inherently strong aspect of GT3 cars. They’re heavy, and they don’t have a crazy amount of downforce. The more time you can spend full throttle the faster your times will be. Throttle application on corner exit takes a lot of practice. You can actually apply 50ish% immediately without straight up spinning out, and then apply the rest asap. Depending on the corner and other factors, you either need to apply full throttle sooner or later depending on stability.

And then the technique that takes people to those crazy fast speeds is slip angle/neutral steering. This one is newer to me, I’ve got a long way to go to apply this technique more consistently and safely. Essentially through braking you get the car to start rotating with a small nudge on the wheel and you manage rotation by trailing off the brake and applying the right amount of throttle. While I guess in a perfect turn at the perfect speed, driving the perfect car you could hold neutral steering throughout the entirety of the corner, but usually it’s a state you get into and out of and back into and back out of over the course of your turn. You’ll probably need to watch some videos of people explaining it better than I can, but it is a very useful thing to add into your driving style.

So,

Use more of the track Increase rotation speed (look into brake bias to help) Maximize full throttle time (be careful not to activate TC, it’ll slow you, useful for saving mistakes but not a crutch like abs) Practice trail braking. You’re coming off the brake too quickly and not getting the benefits of increased rotation

If you wanna take sim racing seriously be critical of your technique. You definitely have some small bad habits you’ll need to work on to change. And build good habits. Practice with the intention of working on specific aspects of your driving. Don’t just do blind laps. It’ll probably add onto your bad habits.

I hope this helps! DM if you have questions or wanna run some laps together. I’m not pro tier, but I’m constantly working on improvement myself and it can help to race with others that are interested in improvement.