You either need different speakers or you need a SUBWOOFER. Increasing the bass through hardware or software isn’t going to help, and will likely only destroy your speaker.
I agree. If you have low quality speakers, get a cheap active subwoofer. A small 6 or 8 inch would probably work.
Or if you really want software, then you can probably google “Digital software equalizer” or something similar or send your output signal to a hardware EQ, (if you can get one of those 12v eq made for cars it would work), before it goes to your amp.