Beside of improving your posts to get merit you still have an option to eliminate those limitations.
Many of these limitations can be eliminated with a
copper membership. In particular, you can set a signature at Member level if you wear a copper membership.
But its the best to get merit through your efforts by contributing to the forum. There might be things related to cryptocurrencies that we may not know but you know it, if you share and its valuable you'll be appreciated.
OP follow this step.