This list is from an article I found in Reader’s Digest (here). I can’t vouch for all thirteen of these, but a few might be worth trying if the “usual methods” aren’t working for you. Good luck!
Create a “moat” around the object by surrounding it with adhesive tape placed sticky side up. See more uses for Adhesive Tape.
Use a baster to blow small amounts of boric acid into hard-to-reach corners.
Keep ants at bay by drawing a line around home entry points. The ants will be repelled by the calcium carbonate in the chalk.
Sprinkle a line of flour along the backs of pantry shelves and wherever you see ants entering the house. Repelled by flour, ants won’t cross over the line.
Place the flowerpot upside down over the anthill. Pour boiling water through the drain hole and you’ll be burning down their house.
Squirt some lemon juice on door thresholds and windowsills.
In a blender, make a smooth puree of a few orange peels in 1 cup warm water. Slowly pour the solution over and into anthills to send the little pests packing.
Cayenne pepper sprinkled in spots where the ants are looking, such as along the backs of your countertops or on your baseboards, will tell them that no sugar is ahead.
Place a plastic container on the bottom of each picnic table leg, then fill with water.
Sprinkle salt across the door frame or directly on their paths.
Herbs and spices
Flour, sugar, and paprika can all fall prey to ants. Keep these cooking essentials safe by slipping a bay leaf inside your storage containers.
For an effective organic ant repellent, scatter talcum powder liberally around house foundations and known points of entry.
Serve the ants on your premises with an eviction notice. Pour equal parts water and white vinegar into a spray bottle. Then spray it on anthills and around areas where you see the insects.
Comment below if any of these worked for you.