The best advice will come from a female friend who is close to his age and lives in his area. Suggest he finds one of those to help him pick the best app/site and put together a profile and alternates of where people in that area meet.
If he asks you, though, all my 20 something friends are unanimous in their opinion of Tinder - it’s for hookups, not dating. Do some people end up lucking into someone to date and have a long term relationship? Sure, but that’s not what most of the users are seeking so it’s not surprising it’s not happening for him.