Longest running manga.
HNI is one of them. We are closing in on 30 years. About the same as Berserk.
https://honeysanime.com/top-10-longest-running-manga-best-recommendations/
Honestly if this is Ippo's last fight I wouldn't mind. Takamura has a much more interesting road. A lot of fans want the closing bout to be him vs Miyata if he did beat Ricardo. Unifying the WBC and WBA belt.
Sendo, Takamura, Mashiba seem like more compelling personalities. Aoki and Kimura should have been taken out of the story long ago. Itagaki is meh. Volg met his goal, doubt we'll get much more from him.
So the last major stretch of the manga I'm guessing it'll focus on:
Sendo's world stage matches and possible title shot at Ricardo.
Miyata gunning for the WBC belt.
Takamura getting more belts and possible eye ending injury.
Ippo either gets back into a groove and contends for the belt or retires and supports the gym/family business/gets with Kumi.
Itagaki and Mashiba wins some more matches. One or both might go to the world stage but fizzle out.
Aoki and Kimura stop boxing. By some miracle one of them finally wins a national title. Aoki possible revenge against Iga.