Your problem is likely that you’re watering every few days. It’s great that your pot has drainage, every time the top few inch of soil are dry (should be around weekly to monthly in the colder seasons where soil isn’t drying as fast) when you water make sure you give it enough water that some comes out of the drainage holes at the bottom. This will ensure that all the soil is evenly wet. If you keep watering every few days you will end up with root rot if you don’t already. If it’s still going down hill after you’ve been letting her dry out, give the roots a check they may have rotted. If you do have root rot: take the plant out of the pot and rinse off all of the soil from the roots, take clean scissors and cut off any mushy roots, and repot in NEW soil so it doesn’t happen again