If that's all you've used your PS4 games for this generation, you're missing out. IMHO, the PS4 didn't really hit it's stride until 2017, but it's been putting out bangers since then. I'm in my mid-thirties and have been a gamer since the Atari generation, and I think you can make a compelling argument that 2017-2018 were some of the best years in the history of gaming.
While it may seem like a lot of PS4 games are just a nicer can of paint on PS1/PS2 games, that's generally not the case. There's been substantial improvements to quality of life (i.e. everything works how you expect/want it to, you aren't fighting controls/camera/etc) to the point where it's very hard to play even great older games now. I was never a huge Sony fan (I went Dreamcast, Xbox, Xbox 360 before eventually grabbing PS3 & PS4), but I have to hand it to them, they've killed it in terms of first party support late in the generation and indie support early (unfortunately that's gone down). The indie scene is now better than ever for consoles, with games like Celeste drawing perfect scores from major publicaitons.
If you want some recommendations that I think any gamer would enjoy, check out Horizon (my favorite game this generation, can easily be found for $10), God of War, Spiderman, and Bloodborne for the first parties. On the indie side check out Celeste, Edith Finch, Dead Cells, Rocket League, Inside, & Shovel Knight.