Of course there's a way to potentiate your little butalbital pills. You can throw another CNS depressant into the mix, say alcohol, opioids, ethanol, other barbiturates/benzodiazepines etc. But, it can't really can't be condoned on here. Mixing depressants is quite dangerous, even with something relatively weak like butalbital. When combining, the sum is greater than the individual constituent parts.
I suppose you could try something along the lines of a sedating antihistamine or some cannabis. Drinking one or two beers might be okay, but I'm not aware of your tolerance or how you might react. The mixture of alcohol and barb even in a relatively small quantity could be enough to take you off the rails. Really try to use your best judgement and make sure this judgement is pondered while not under the influence of barbiturate and alcohol. Literally anything could seem like a great idea in that instance.