How to pump more milk?

I’m 3 months postpartum. When i pump, i only get 1oz (.5oz from left boob & .5oz from right boob) . I normally pump 2 times a day (morning & evening).

What can i do to increase my milk supply?

How many times a day should i pump? Does it matter at what time?

I have never been able to pump more than 1.5oz 😞

Please help! I feel like giving up