I’ve only found a few smartphones with 8 GB RAM, 256 GB storage, and a 750G:
OnePlus Nord CE 5G, 12GB ram, 256GB storage, black/blue which costs 370-400 EUR and is a budget Chinese brand.
Samsung Galaxy A52 5G (8GB, 256GB storage) which is blue and goes for 527 EUR and has the Samsung tax (and bloatware).
The A-series is Samsung’s mid-end line-up!
If you assume Fairphone 4 competes with the latter, the Fairphone tax is only about 125 EUR or one year of smartphone usage. If you can handle 1 more year with the FP4 than you’d normally do with your smartphone, you’re playing quite, money-wise.