Remember the Ringmat? You should!

Try a MyMat.

BTW, the MyMat completely supports the lp by way of hundreds of tiny inverted 'dimples'. These also help to decouple the lp from the platter/bearing.

When I bought my first Linn LP12 about 25 years ago, the guy selling it demoed the turntable with a Ringmat. It sounded awful - thin, lightweight, no midrange. I was disappointed and asked him to put the stock felt mat back on and suddenly the LP12 magic returned. It sounded great and I bought the turntable - with stock mat (that TT is now sadly long gone).
Years later I bought a Ringmat to try myself and had exactly the same experience with a few different turntables.

It was one of those tweaks that became popular for a few years and got good reviews - as happens often in the faddish world of hi fi - and then thankfully disappeared without trace.

To the OP, live with the Ringmat for a while. My guess is that in a few weeks or months you will remember why you put the Ringmat away years ago.

Every mat sounds different .....use the one that you like.....try them all.

I have to agree with Stringreen.
It is hard to just say, "that xxxx mat is a bad one"
It just did not gel with your particular setup at that time.
And that is about all you can say.
I have a cupboard full of different mats I have tried and I am still trying out from over the years.
Do I have a fave for my present Garrard 401?
Sure but does not mean I might not find something I like better or I change tonearm or cart and feel the need to experiment again.

Above all just have fun, enjoy the music and stay safe!