First off, these speakers are not great, but since the price was right you can't complain.
How old are yours? (is there a date on the back?)
They certainly should sound much better than most modern wireless speakers costing $100 or less.
You need to give us a better idea of what you are missing in the bass.
What type of music are you listening to and is it just the kick that is missing?
How loud are you driving them?
Take off the grills if you can and inspect the surrounds around the woofer. Often these will disintegrate over time.
Also, do you have experience listening to another system? If so tell us what it is. Often that can reveal much to us. For example Cerwin Vega makes bass strong speakers and if you have them in your past, most other speakers would sound weak in the bass.
If you are looking for chest thump, that is below 40Hz and you need a subwoofer. If you are looking for punchy sound for the bass, that is in the 90-200Hz range and your speakers should be able to handle that.