blockchain – How can i import my wallet with old address

I had a bitcoin wallet and I have seed phrase but when I use it I can’t access all my old wallet’s addresses I read that I can use this site:
I actually used it and through it I can access all the addresses of the wallet, but I do not want all the addresses, I only want the addresses where there has previous transfers (old received mining reward addresses), and I don’t know what is the maximum number of addresses for my wallet.
To make it clear what I want more:
I opened my wallet, but it is without addresses and without any balances (note that I have previously received mining rewards on addresses that I cannot access now, but they are linked to the wallet
ques no.1 : how to get my wallet old addresses
ques no.2 : is create new address for the wallet or get the all exist addresses