You can bump your nicotine up. That's primarily what gives you
throat hit. LR atties or cartos (like increasing voltage) are just a way to produce more vapor per hit, thus more nicotine, thus more throat hit, so either way you're increasing your nicotine to get more throat hit. The difference really is that you don't have to get new juices if you get an LR atty or carto.
Some may suggest adding a small amount of throat hit booster like Diablo Loco (capsaicin, or hot pepper extract) and some people like it, but in my experience the hit you get from that is very different from that of nicotine, and IMHO not at all complimentary to it. It's much sharper and briefer and just doesn't feel right to me. Likewise, some may offer that pure grain alcohol or menthol will give throat hit, which appears to be defined by some as any physical sensation in the mouth or lungs, but these do not qualify as throat hit as far as I'm concerned. They add a certain amount of
mouthfeel -- that is, warmth in the case of alcohol, or cooling in the case of menthol, but this is not throat hit in the same way nicotine provides a throat hit.