There's lots of flexibility - especially if one does not opt for one of the latest cutting edge processors that's only been available at NewEgg or Amazon for a couple days. I note it is so new, there has yet to be a user review for one at
Amazon.
There's lots of wiggle room with the graphics card and motherboards too. And BTW, both the MSI and ASUS motherboards suggested are currently out of stock at that site.
For sure, all suggested components are great and I sure would not turn any of them down. It is just IMO, when doing a new build with that budget, I would prefer to buy everything I need right from the start, keeping within the desired budget. So if a new case is needed, make room in the budget for it. Same with the OS license. And again, I sure would go for a new PSU too. It does not look like that site carries EVGA so for me, I would look at the
Seasonic EVO 620W Bronze for $95.57 (₹6,536) since all their Seasonic Gold supplies seem to be out of stock too.
It would be good to know which version of Adobe Premiere would be used too. I note the "recommended" RAM with the "Pro" version to edit 4K content is indeed 32GB of RAM. But for HD content it is only 16GB - which is plenty for most games too. In either case, it will run with 8GB, the minimum recommended - but I personally wouldn't settle for any anything less than 16GB.
And for the less expensive Adobe Premiere Elements program, one could easily get by with just 8GB - though again, 16 would be nicer. So if optimal performance with video editing is not a high priority, there is budget wiggle room in the RAM area, as 16GB would be plenty. But either way, more RAM always trumps faster RAM so less expensive 2 x 16GB of 3200MHz RAM, for example, could be another option to free up some budget space for those other needed items.