cocaine definitely has a low bioavailability, and if you have any tolerance, it's ultimately a waste of money. If you're not comfortable with insufflating it, then the only other ROA that I can suggest is rectal, which has a higher bioavailability than insufflation. Please do not IV it or make freebase and smoke it, as those ROAs are extremely unhealthy, both physically and mentally (in terms of addictiveness).