Getting an account on a big general tracker like TorrentLeech is a pretty good foot in the door. They do open signups frequently. There’s also IPtorrents and their whole network, although they’re pretty looked down upon by the private trackers community. If you want to start working towards invites to more selective trackers, MAM, OPS, and RED all have an interview process. MAM is by far the easiest one to build a ratio on, although note that they do not like to be thought of as a stepping stone.

I’m curious how well polished the stuff you get off of soulseek is. Private music trackers have pretty strict standards for uploads, which generally means making sure that everything is organized consistently, that all tracks are tagged correctly, and that things are encoded to high standards (filtering things like bad transcodes). If you’re having to manually check all of this stuff, it would be pretty time consuming for a large collection.

OPS is probably the one you want. RED has more selection but also a very difficult economy. OPS still has a great library and the economy is far more manageable. Of course you will still need to build up a ratio if you’re planning to download a lot

You might want to get on a general tracker like TorrentLeech that has 0day scene releases. But you won’t find as good retention on older releases. It works as a nice supplement to a more selective tracker.