Where to get referrals or interview calls

Currently I am trying to switch from service based company to better environment hopefully product based companies. Thing here is I am not getting any interview calls (I may blame 90days notice) but how product based companies hire… like i am checking naukari. It’s full of consulting companies mostly or service based companies. LinkedIn I could see some job posts but not actually hearing back from them(maybe skill issue) . So like from where these product companies hire ??? Anyone know any leads.