You might ask this in channel#modhelp rather in modding queue forum, so deleting this topic after getting the answer might be a good choice.
Aftering finishing a complete mapset, you can check the ranking criteria to make sure your mapset is At least rankable.
Then, you can request mods in channel #modreqs or this forum, in order to improve your mapset according to modders' advice.
If you are confident enough with your mapset which has already obtained at least 5 hypes, you can find bn in queues or other privite approaches, so that they might nominate your map if interested. Remember to read their rules.
At last, when your mapset had 2 nominations and no issues had been found in a few days-- Congratulations! Your mapset had been ranked!