https://www.pcgamer.com/this-fallout-4-mod-creates-missions-on-demand-from-assassinations-to-base-captures/

There are heaps of brilliant Fallout 4 mods that give Bethesda's 2015 RPG a new lease of life, and Missions Committee, a new mod out this month, sounds like it's another one worth considering. It's a mission generator that will periodically ping you with one of seven mission types, including target assassinations and base captures. 

Best of all, you can customise how often you want to receive missions, and if you want something immediately, you can request a specific type of mission on demand. The mission types sound suitably varied: you'll destroy artillery posts, perform stealthy recon strikes and defend bases against enemy forces.