Chapter 73 is included in the final tankōbon volume (Volume 12) , which was released in Japan on November 4, 2022.
Title: Busu ni Hanataba wo — Chapter 73 (Raw) busu ni hanataba wo raw chap 73 raw manga welovemanga
(Note: Always be cautious of malware on unofficial manga sites and support the artist whenever possible.) Chapter 73 is included in the final tankōbon