I completed Like a dragon earlier this year and enjoyed it very much that I have not stopped thinking about it, the characters in the Yakuza series are so good, fleshed out with detail. I had to know the story of Kiryu so started playing Yakuza 0 up to chapter 5 at the moment and loving every bit. It is daunting at the prospect of having to play six games in the series to understand everything but when these games are so good why not?
Cost me £50 to get all six games, I purchased Yakuza 0 digital on sale for a fiver and Kiwami was given away on PS+. Kiwami 2, Yakuza remastered collection (Yakuza 3 to 5) & Yakuza 6 I purchased physical.
Not sure if he has sold them but @teddymeow had some of the games in trading recently.
TLDR - Play the Yakuza series, if you liked Judgement you will love Yakuza.