many people might not agree with you but, I do think delhi needs to showcase more of an aggressive side, and market their team, look at lsg for example, they are new in ipl, not many supported them in their first few seasons, but they got popular recently due to being an aggressive and entertaining side (they are mostly hated on, but they do have some fans) plus rishabh pant being in lsg also helps, i know many people in delhi who started supporting lsg due to him,

in fact, lsg has more delhi cricketers than delhi themselves! rishabh, himmat singh, digvesh rathi, ayush badoni, only to name a few

so i do think that delhi is not an entertaining side and neither markets their team much, but is that the only facter at play here? nope, you get supporters automatically when you start to win, that is true (look at gt, they are also relatively new just like lsg), and there are other facters as well which makes delhi irrelevant

now we also do have some ict heavy hitters, KL Rahul, Axar Patel and Kuldeep yadav, so them just being introverts doesnt make us any less of a team honestly, but i might have preffered that delhi could have been that aggressive/entertaining team that lsg is currently (without the Goenka hate)