I also recommend sticking to prescribed dosages. Reasons being that, first of all, benzos are not "fun" drugs. The high they produce is subtle, in fact delusions of sobriety are common, meaning that you are quite intoxicated in terms of lack of coordination and impaired judgment, but you think you're not really feeling that much. So dosing higher doesn't really produce a substantially more pleasant experience. The other big reason is that dosing higher will produce a tolerance buildup, so your prescribed dose won't work as well anymore. This leads to increase in dosage to get the safe effect, which leads to much more pronounced dependence and rebound anxiety when trying to lower your dose. Even dosing much higher once, if you're already on benzos, can lead to reduced effectiveness from your usual dose. You are likely already somewhat dependent if you've been taking them daily for a while. So experimenting with higher dosages is going to make you run out early, and you're going to go through very nasty and potentially dangerous withdrawal when you run out and can't take them for some days. Totally not worth a boring quasi-high.
Alcohol is much more recreational anyway.