Janembox

The thing is that the market has changed now in general, those big series (naruto, bleach, one piece, dragon ball etc) were released during the golden era of anime/manga which is why they managed to become that big, today the market is a lot worse and its impossible for a manga to have as much of an impact, during mid 2010s there was still room for big series which is why we had stuff like hero academia, black clover, demon slayer and jutsusu kaisen but even they were not as popular as the big 3 and lasted a much shorter time

Hero academia ended ages ago, hunter x hunter is pretty much a cancelled series, and black clover dropped out of schedule but its near the end as well, at best couple more chapters left

What? Isekai are a background thing and were never mainstream in terms of market share, their sales are literally at the bottom, even the worst selling shounen sell better than all the isekai combined, also solo leveling is not an isekai and it ended ages ago

this article refers to manga in general, because shounen are pretty much 99% of the manga market, (including the sports shounen like blue lock)

There was no "competition" since long time, all of the popular non-shounen jump titles finished ages ago, like fairy tail, tokyo ghoul, attack on titan and seven deadly sins, today asides from maybe blue lock there is nothing noticeable from those magazines either,

and the only relevant titles shounen jump has left are one piece and chainsaw man (without counting black clover which dropped out of schedule), its just that the whole market changed in general

the person who wrote this article obviously has no idea what theyre talking about, the wrath dragon was an arc in season 3, in fact season 3 adapted the 2 following arcs after that as well, season 4 begins at arc 17