Always start with the goal. More dynamics and bass is a good goal but you should be more descriptive. Dynamics … a broad term … are you simply looking for more slam (macro dynamics), more subtitle micro dynamic detail that gives nuances like decay and ambience. Bass … are you looking to have better extension into the sub bass region, or more tuneful bass detail that lets you differentiate between the character of different bass instruments and players.
If you like your system your first start is placement and room treatment. Bass detail and dynamics can snap into focus with minor changes. Speaker vibration isolation also gave my system better performance in these areas and can be tried. These two areas are low cost solutions you can experiment with. Other than that, I do not think anyone else but you can say which change will have the most impact in your environment for both your current equipment and desired equipment is published to perform well. In general with upgrades … speakers, room treatment, front end, amplification, and wiring is my preferred sequence for change. Demo and let your ears choose, not anyone else’s ears.