A very easy solution for this.
Just watch Seinen anime instead.
The vast majority of anime that have exaggerated sexual content and have fan service are usually going to be shonens, shojos, isekai, josei, and slice of life anime where anime that are part of any those five categories are usually going to have the stereotypical anime tropes. So if you don't care about fan service or other sexual content then avoid those five genres of anime I've just listed. If you think you're going to find any mature and intellectual content in shonens, shojos, isekai, josei, or slice of life anime then you're going to have a bad time.
It would be like being excited for watching a horror movie in a theater and you pay your ticket and then you complain that said horror movie has gore and brutal violence. What were you really expecting?
If you want more serious anime that is more mature and is more intellectual then go watch Cowboy Bebop, Legend of the Galactic Heroes, Ping Pong the Animation, Monster, Thermae Romae, Hellsing, Trigun, or literately every Miyazaki film every made.
It be like saying all movies are the same because you've only seen Disney movies when there is more to movies than just Disney. It's the same laughably bad take that Jerry Peet made with anime a long time ago where he said all anime is the same because he watched old shitty 4Kids and Seban Entertainment dubs to judge anime as a form of entertainment media.
Anime is a spectrum much like movies and video games where there's more to anime than just Dragon Ball or Naruto.
Even MrEnter was never this fucking dumb when it comes to animation in general.