Say, you’re looking into a certain position or deal but must get through to certain managers, agents or owners. You may perform mind-control magick. A number of Spirits such as Paimon and Dantalion may assist.
Purple candles, controlling oil (made of licorice, sweet flag/calamus and bergamot oil) as well as photographs, signatures and business cards may be used. Puppets too, maybe.
But say the deal you’re aiming for IS realistic (you’re qualified and hard-working enough) but very tough to get (because of all the competition etc.). The level of strength employed in your ritual would need to be even greater than usual, and could possibly come close to a curse or an hex.
Any more methods? I prefer rituals that require less material and space. I guess that pacts, even blood pacts could be advisable in such cases.