Have you tried TTW? It might bring a new life to your Fallout 3 and/or Fallout New Vegas.
TTW is a project that allows to play Fallout 3 and Fallout New Vegas at the same time using the FNV more polished engine. It also adds FNV stuff to the Capital Wasteland (we made recipes, harvestables, changed all weapons and armor to fit the FNV system, all FO3 specific weapons have iron sights, can use the different types of ammo and some have weapon mods, placed doctor bags around, placed reloading benches, campfires for cooking, all food and water specific to FO3 now works with hardcore mode, plenty of FO3 and FNV mods that were converted to affect both wastelands, we even have TTW specific mods).
Well I know I am shamelessly tooting my own horn, but many people said that TTW gave them many new hours out of the old FO3 and FNV games. So I thought it might help you too.