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As for now it's been more than 40 years NASA launched Voyager 1 & Voyager 2. With more advance technology wouldn't it now be a good time to continue sending more sophisticated voyagers out there? Wouldn't it be a good way to gather more data & it will increase the chances of letting them (If they exist) our presence, right?

Did NASA stop sending off probes like that anymore?

It does:

Galileo: Launched in 1989, orbited Jupiter for 7 years.

Cassini-Huygens: Orbited Saturn for 13 years.

New Horizons: Fly-by of Jupiter and Pluto.

Juno: Currently in orbit around Jupiter.

NASA (and ESA) have created multiple outer planet probes. But they are costly and there is no reason to repeat what has already been done. So each mission has a different aim and purpose. Often this means not doing a fly-by, but getting the probe in orbit around the planet.

Uranus and Neptune have not been re-visited. They are very distant. Getting a probe out to them is possible. Getting something out to them in a reasonable amount of time and then getting it in orbit is much harder, and they are, perhaps, less intrinsically interesting than Jupiter and Saturn.

The voyagers did carry gold disks, but this was not a serious attempt to contact alien intelligence. It has a symbolic purpose. A record of humanity will exist somewhere in the galaxy long after we are gone.

Like James K's answer details, probes have been sent to the outer planets even after the Voyagers.

However, the specific trajectory used by Voyager missions has not been reused. In fact, it was the specific position of the planets that inspired the whole program, initially called the Grand Tour.

The relative position of the outer planets in their orbits in late 1970's allowed a space probe to visit many of them and to achieve great speeds using a sequence of gravity assist maneuvers. This position only repeats once every 175 years, so it is very likely that future space probes in 2150's will take advantage of it.

It's a question of science return on investment. As @JamesK's answer notes, NASA has done several orbiters since the Voyagers. You get greater ROI when your probe can stay near the body you're interested and continue to observe it for a long time. The only Voyager type probe in that list is New Horizons, in the sense that Voyager type probes only do a flyby. In the case of Uranus, and points more distant, as @JamesK noted, it's extremely hard to get there in a reasonable time, and then slow down enough to enter orbit. So for them Voyager type probes have an advantage.

They never stop sending probes into space they are just in a differnt serries of craft much like an airplane why we don't use the first airplane model any more because we gotten more advance over the years same thing with probes, just got diffent names and differnt missions...