Moving from java to infra or SRE team

I have experience of 2.2 years in any of WITCH companies Earlier my trainings are done in java full Stack ,but after some client interviews inside the company ,as I have not cleared any so, they moved me in non tech that's actually sucks but now , I got release from all of them I not obviously not very good in coding and java but from last some months, I'm continuously trying to upgrade myself but according to market its very rare that hiring for java developers 2 years of experience ,everywhere they are hiring for 4 to 5 years minimum and for me to they are expecting to know all HLD & LLD and many more things So, one of my friends suggested that I can move into the INFRA or SRE team or study for that even if he can refer me for that but for that I should have some practical knowledge in that

So, any suggestion from where I can study these things any udemy courses or YouTube lectures Or should I be searching for java opportunities outside as already I have been doing this for the last two months

Any suggestions would be highly appreciated !!