Get a micro USB cable set that is rated 2A or above. Make sure its a charging cable not a data transfer cable
Charging cables tend to have bigger 2-conductor cables
Data transfer cables tend to have smaller 4-conductor cables
If you like DIY you can make your own, just more expensive and time consuming...
or better yet get a 5V 2.5A mircoUSB power supply set. Plug and play... finished
I power up my 32GB microSD bootable RPi3B, fan-cooled, WiFi connected, bluetooth enabled, with I2S DAC HAT, 2.5GHz unifying dongle (for keyboard and mouse), and powering a small 5-LED desk lamp, on just a 5V 2.5A power supply set. Dont even see the "Flash" insignia whenever I insert and access a USB thumbdrive...
"Don't come to me with 'issues' for I don't know how to deal with those
Come to me with 'problems' and I'll help you find solutions"
Some people be like:
"Help me! Am drowning! But dont you dare touch me nor come near me!"