The problem is though, this can only partially be resolved by rule changes, unless they become exceptionally prescriptive.
Things like fuel saving for example - simulations etc. are so advanced these days, these guys are honing on in the precise optimum point between 'use more fuel and go fast' vs 'more fuel weight slows us down'. The only way around this is to mandate that they all start with waaaaay more fuel than they could possibly use, so that there is no balance left to achieve. Tyres would be even more difficult - again, even if they could go mad, these days they won't because they'll be running computer sims telling them the optimum balance between wear and lap times - they won't go pumping in qualy speed laps if it'll hurt them in laptimes later.
The sport is getting to the point where it is so advanced and so focused in on achieving optimum solutions, that it's going to struggle to provide more excitement whatever you do. You'll be in the realms of artificially manipulating things and the purists won't like that either.
None of this would be changed by making the cars noisier and less fuel efficient. The boring factor comes from how 'perfect' they can plan everything these days - that's why the exciting races are the ones where unpredictable things go wrong and it upsets the plans.