One common-sense approach is to identify all potential "changes to the system" (both in terms of physical placement of the current components and any potential component switches). This list can be helped by re-reading this thread and summarising the recommendations).
Once you've got these listed, the next step needs to calculate the cost of each "change to the system" and then sort the list into ascending order of cost.
Then start with lowest cost option (preferably a no-cost change) and try all possible permutations. (This is likely to be re-positioning of the speakers relative to each other and relative to the listening position - in which case use Google to track down reviews of your speakers and read what the reviewers have had to say regarding recommended positioning).
If, after a change, you are satisfied, then stop!
If not, then move up to the next lowest cost option and repeat until satisfaction arrives.
Once you start to consider any option with a cash outlay that concerns you, go visit your nearby audio dealers and ask them if they're prepared to assist you (with no guarantees of any purchase) and, if they don't seem too keen, you can always explore some form of consulting fee to recompense them for their time and, possibly, for some trial equipment).
If you get to the point where the cost factor exceeds your budget and with no resolution to your perceived problem, stop the process and learn to live with what you've got. (This helps keep one's marriage on the level...
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Diving in and replacing a big-ticket item at the outset brings a risk that you wind up out of pocket and with little or no improvement for your money.
The decision on how you approach this process (and what you spend) is yours to make (and to live with). Over the years (particularly in the early ones), I've made the mistake of "diving in" and regretted it afterwords. Nowadays, all my changes are made via this "least cost first" approach and I've avoided some unnecessary outlays.
Dave