Last time the element went on our built-in oven I just bought a whole new oven because it would have been £35 for the element or £95 for a whole oven and the thing was needing a right good clean and it was much easier to just disconnect and bin the old one.
If you have a working oven, just keep it, the amount of electricity saved would probably be negligible.
If you're cooking for one or two people, a small tabletop oven might be worth a try, we got one as a stand-in when the main one broke and have kept it.
Works surprisingly well and gets used regularly.
This sort of thing:
https://www.amazon.co.uk/gp/product/B077P96Y4M/