If I'm missing "a lot of points" please mention at least three. Sounds fair?
First, I do not suggest to completely stop to sell oil in one moment.
Second, "everything is more expensive" at this time, once withdrawn a part of that money, "everything" will be somewhat cheaper.
Third, that what is just 'saved' is a bit, the budget has been deficit from the time the crisis started, mostly the money just eaten away on things many of which Russia could produce itself and spent on things that make "everything is more expensive".
Let me be more specific. So, what do you propose to sell right now? If that is not oil, than what?
Right now I'd propose to reduce selling oil by 20%, to lessen the government costs with the exception of public-sector ones like of schools, hospitals, pensions.