Any suggestions on getting a loved one to see that they have dementia and would benefit from assisted living instead of living at home alone?

My dad is 92 and absolutely will not give up his independence. He has dementia (as diagnosed by a geriatric psychiatrist) and is very frail. Dad's wife passed away 3 years ago. Before that, there were caregivers in the house for her and they helped him a bit. After she was gone, he would just sit in house house or just go out and drive around. He lost his license about a year ago and continued to drive just to get out. FINALLY, this summer with the help of a care manager, we were able to talk him into bringing some outside care in. We started out slow - just 2 times a week - and stepped it up a little at a time. They are there 4 hours a day for 6 days a week (I am there on Saturday). It has made a huge difference. They pamper him, cook for him, take him on errands, etc. He really enjoys their company. We have multiple people from the service that he knows now. We are using this as a stepping stone for when he needs to go to assisted living (which he really should be in right now but refuses to go to one of "those" places.) Having a care manager has been a big help for me because they are able to manage services and get him to appointments. I work full time and am not available during the week.