Hi @Krishna Tamrakar ,
unfortunately Azure Free Subscription aren't eligible for quota increases.
Free Azure trial subscriptions aren't eligible for limit or quota increases. If you have this type of subscription, you can upgrade to a Pay-as-you-go one. For more information, see Upgrade your Azure account and the overviews for Try Azure for free or pay as you go.
These are the rules of Microsoft. Sorry.
(If the reply was helpful please don't forget to upvote and/or accept as answer, thank you)
Regards
Andreas Baumgarten