How can a GT improve

The difference with any new models within the last 10 years or so is the consistency, and retained ball speed and reduces spin on off-center strikes. You likely won't see significant gains on center strikes with both models, but you may see more consistent results across the face.

The new technology in drivers is not 100% geared towards making your best, center-face shots better than they were before. In fact, I'm pretty sure driver tolerance has been restricted to the same smash factor and ball speed off the center of the face for quite a few years now. New drivers make those off-center, less than perfect strikes lose less distance, go less off-line and with less spin differential than previous generations of drivers. If you consistently strike your driver dead center every time then, congratulations...you're better than every other golfer on the planet. Keep your current stick and work on your putting and chipping!

If all you're looking for is distance, shop around. If you want to be a player, settle in on a club you're comfortable with, learn to work it both ways. Most bombers are either on the mini tours/Korn Ferry hopefuls or trying to figure out how to break 80.

Increased distance is not a promise. Otherwise I would have just gotten a new TM driver with every 4-6 month release for 10 more yards with each release they did for awhile.
With the GT and possibly a first time fitting by Titleist fitters, many will see improvement. It might only be a better dispersion pattern or 5 yards more. Or, with a better match to their swing, 10-25 yards more distance. Titleist does have the 2 year release cycle so they have found what they feel is a general improvement and not finding out by user experience that new is not better.
At a consistent 290 yards, if you are hitting 50% plus fairways, then you don’t need to change. We just need to be honest with true averages, not our best 13-3 drives from any round.

As noted, rules regarding head design limit radical improvement. Regardless of vendor, improvements are incremental with Iron Mike and on the order of 1-3 yards per release For us humans, being more variable in our swings results in different head designs and shaft performance. Something like the GT maximizes off center hits to lose less distance.

Using a Titleist certified fitter will improve the chance that the setup will best match you. Off the rack is hit or miss on being the best fit for you. If fitted, did the fitter try multiple shafts and explain why those choices were tried? If you feel the fitter did all of this, then you likely won’t see much benefit. All depends on your expectations.

Brock and Joey hit it on the nose. New technology pretty much can only improve your mishits. If you can consistently hit the sweet spot and keep it in the center of the fairway, there are a plethora of drivers out there that will work for you. If you struggle with either of those like most of us do, a new driver head and fitted shaft will help you. Every time you here about added distance, it is usually related to mishits, or due to a shaft change.

You're exactly correct, I'm a pretty consistent striker of the ball, there's a dozen good manufacturer's (that I've hit) making great clubs, several of which have little professional golf showing, as they don't sponsor major players. We're fortunate that Titleist maintains a position in the Top 3 consistently, which is a very hard thing to do.

I've seen what TM and cally have done the last 2 years, Ok nice but if it's just faster on-off center strikes, tighter spin deviation then that's a good thing right. Look at just how impressive the TSR line was and to improve on it even in the slightest way is enough to say that Titleist is no way playing catch up to any other brands out there. The TSR line up can easily hold its own against anything new that has been released for 2024. I'm pleased with their 2 yr cycles releases as nothing out there is going to blow the industry off their rockers with new release. That's just not the case.