If you have trouble like me getting more #Settlers into your settlements then just follow the below steps that have helped me!
Food – The more food you have, the more people you can get. Just planting food will not be enough. You need to assign a worker to the food so it can be counted as a resource in your Workshop menu. To assign a worker, go into the workshop menu and click on a settler. This will make it so you are commanding him and can use him where you see fit. You can command them to harvest food, to go guard posts and work at work stations.
Recruitment Radio Beacon – You will need a generator, a power pylon connector and of course, the recruitment beacon. Place the generator anywhere you want and place the power pylon and recruitment beacon near it. Use triangle (Y on xbox) on the pylon to connect the wire to the generator AND therecruitment beacon. The beacon will automatically be on and you can turn it off if you think a settlement is getting to big. (I don’t always use the following sometimes just a beacon and a generator connected with a wire will do the job)
Water – Making sure you have enough water is another key. I try to keep it around 1 per person and normally go a bit overboard so I can stay away for awhile if new settlers come. A water pump doesn’t need to be manned by a settler and is pretty easy to make.
Beds – If you have 17 settlers, you need 17 beds. It is always good to have extra beds so new people can come and join while you are out adventuring. This is what I found the hard way, sometimes you just need to have more of everything to keep them happy.
Defenses – This isn’t 100% needed to get more settlers but it will help keep your settlers alive. Every now and then a camp of yours will be raided and you can go defend it. Placing turrets, traps and guard posts will increase the defense of a settlement and increase the odds of your settlers surviving.
You can assign a settler to work at a guard post to increase defenses with that. You can also give settlers new weapons and ammo to help out when the raiders attack. I would avoid explosives though, they are more likely to blow themselves up with it then use it properly.
I generally forget about the little camps from the #Minutemen missions and concentrate on building up the main ones first. You can always sort the smaller settlements out later on down the line. Currently I am building up the #Castle, #StarlightDriveIn and of course the #Sanctuary