I want to read some of the most life changing romance books

I love romance but for the past year I feel like the modern romance book industry has suffered a severe decline in quality. The last romance that seriously changed my life was outlander by Diana Gabaldon & I’ve since stepped away from romance a bit but now I’m interested to try again. Romance doesn’t have to be the main plot but I want substance, good characterization, world-building, & so much more. I’m interested to start classics so any recommendations is welcome as well! I’m welcoming all types of recommendations!