I highly recommend you perform the following procedure. If it works, it will save you from purchasing a new radiator:

Pull the radiator out of the vehicle. I know, it's a PITA, but, it's worth it.

Hold the radiator up to the sun. Look through the fins. See all that crap?

You mission, should you decide to accept it, is to remove every bit of that crap which is blocking airflow in a big way.

Use compressed air, a chemical cleaner that foams, and a whole lot of patience and repetitive cleansings from the rear side of the radiator to attempt to flush as much of that crap out as you can. It takes a good two hours and it won't be perfect, but, you'll drop the temperatures at least 5°C. and maybe even 10°C. if the radiator is quite bad.

Unfortunately, there is no tool that I could find that can be stuck into the fins to clean them. I think even pipe cleaners are a problem, but, I haven't tried it.

If this does not solve the issue, then the radiator is partially plugged internally and a new radiator is probably going to be required to significantly drop the temps.