Resell the 8GB of RAM and buy an even better phone then? That's 150 euros of value right there.

Then use the money on a reputable second hand store to buy a used S20 5G 128GB for 150 euros, or a S22 128GB for 145, maybe an S21 Ultra 5G 256GB for 139, and you've got yourself a valiant workstation already (Samsung DeX works great out of the box, no need to wait for Google here). I can also find an S20+ 5G 128GB for 75 euros with display damage (but that doesn't matter when you hook it up to a monitor).

On another website I can find an S20+ 5G with cracks in the edges of the touch screen for 50 euros. That's 12GiB of RAM, 128GiB of storage, a 3200x1440p@120Hz screen and 5G connectivity built in. You're gonna need a Bluetooth mouse and keyboard (that's like what, 5 euros?) to hook it up to the TV but then you're good.