If you want to upgrade to a Xeon, delidded has a very useful guide: https://www.delidded.com/lga-771-to-775-adapter/2/
But if you were to get that, you would have to get a GPU like a 750 ti.
A Xeon would cost $10-20, and a 750 ti $40-60.
That's already $80, and you would almost definitely run into some RAM issues, so upgrade that by 4gb, and that's another $30.
That's $110 in a dying platform, it would be much wiser to get 4gb of fast DDR4, a B350 (or in a month or two, B450) motherboard, and a Ryzen 3 2200G, and just slap those in the existing rig as those would allow it to be much more modern and powerful, for about $170.