City is quite difficult. You have to have a matchday membership and then it sometimes goes to previous season/game requirements. This year, they’re releasing it batches but they’re selling insane fast even with the rule of 1 ticket per member.
I won’t recommend third party sites as it can get messy although I hope you have some luck!
What club/s? Tickets for the full season usually go on sale in their entirety before the season starts. Then it will go to members and if you hit criteria.