I've gone through this route, just checking your model of phone it supports OTG so I think the problem may be that your card reader is not OTG compatible. When I had a phone that was Micro USB I bought an OTG hub, from memory around 400 baht, put my non OTG Transcend USB 2.0 card reader into one of the ports and the phone recognised it via the hub. It's easy with my USB C phone now as Transcend have a Type C Card reader that is OTG compatible, no problems.
Try one of these cheapies from Lazada
https://www.lazada.co.th/products/sdmicrosdtf-card-reader-to-type-c-micro-usb-usb-lightning-otg-adapter-usb30-i1189966704-s6637970031.html?exlaz=d_1:mm_150050845_51350205_2010350205::12:16450510680!!!!!c!!6637970031!135265863&gclid=CjwKCAjwi8iXBhBeEiwAKbUofT75h6vk6ehfJVbYq4zmvKI2ovqVy_gVw39ISw-IZoQO6x2qFr9V0RoCCosQAvD_BwE