Hi Supravista,
Thanks for the update … I appreciate it.
There will be a break in and adjustment period for any new mattress or sleeping system as the foam layers lose any of their “false firmness” and the cover stretches and loosens a little and your body gets used to a sleeping surface that is different from what it is used to (see post #3 here). This would typically be a few weeks but it can be shorter or longer depending on the specifics of the person and the mattress.
It can be quite surprising to some people how much their sleeping experience can change over the first few weeks of sleeping on a new mattress and I would tend to give any new mattress about a month or so if possible before considering any changes.
If after 30 days or so your sleeping experience shows a clear and consistent pattern that isn’t changing then that would be the best time to decide on the types of changes that will have the best chance of resolving any “symptoms” or discomfort you are experiencing.
There are thousands of mattress pads or toppers that can be added to a mattress and used to change the “feel” or to add some additional softness or pressure relief but I don’t know what you are hoping to change about your mattress and your question is much too general to be able to make any meaningful suggestions.
The type of mattress pad or topper that you may wish to add would would be a preference choice rather than a “better/worse” choice and would depend on how much additional softness and pressure relief you would need and on the types of materials and the “feel” that you tend to prefer. You can read a little more about fiberbeds and mattress pads (which use polyester fibers) in post #10 here and in post #2 here.
If you decide to make more significant changes to your mattress and add a topper then there is more information about choosing a topper in post #2 here and the topper guidelines it links to which along with a conversation with a reliable supplier that can provide you with good information about how their toppers compare to each other or to other toppers they are familiar with that are available on the market can help you use your sleeping experience as a reference point and guideline to help you choose the type, thickness, and firmness for a topper that has the least possible risk and the best chance for success.
Phoenix