Exclusive AMA: Optimizing your Inventory Management with Shopify Experts!

I couldn’t find a location to start a thread to post my question.
Our inventory changes often with different items, prices, colors and quantities. I need help with the efficient steps on these changes . Here’s what I am currently doing - and its alot of manual input.

I have been exporting inventory by categories individually first, example violin strings. I export from our point of sale and inventory system. Then I copy the categories I need into the shopify sheet with the headings, such as title, sku, quantity. I make all the titles, alt text, descriptions, url, Put everything into draft, then download to a csv file. I take that csv file and upload into shopify. I pull the draft products of that category - in this example violin strings. Then one by one manually I open the product, add images, add the category and then set active. I do this for each category. we have 12 categories.

For example I did this for the violin strings - all 162 products last week, today there are different prices and quantities. How do I get the new prices and quantities on Shopify without loosing all my alt text, url, descriptions, photos. etc?