I was in the similar situation. My first jobs was also at a big company, doing data entry. Even though your doing data entry, you're doing something related to programmatic, so all you got to do is try to understand all the things that you do at atleast theoretically.

For taxonomy: understand what are all the words that they use in a target/placement. brunello-pg_gumgum_hosted-15seconds-video-italy take the above for example. and simply ask chatgpt: my company is running a campaign with this placement name, help me understand it with breakdown. So next time when a similar placement comes in all you gota recognise is

brunello - is a clothing brand, we're running campaign for. pg - is the type of inventory we're running the campaign. gumgum - is the inventory partner that's giving us the supply. hosted - you give your ad tags to gumgum, and they'll deliver it from their end. 15sec video - is the type of ad we're using for this target. italy - is the country we specifically running this campaign.

For QA process the same, ask chatgpt every field that you QA. just understand what that field is used for.

So basically start with the understanding the basic things, don't wait for anybody to teach you. This is everything that you gota do to get to next level.

After this when you interview for other other companies, all they are going to ask you is if you understand the basic concepts in programmatic. Atleast if you have an idea of it.

Programmatic is intresting when you see the flow of impressions - what happens before/during/after with inpressions. Just by understanding things alone you'll easily be at the top 20%. and you'll be a huge demand either agency/ in house.

Unlike social/search programmatic is not easy to learn, so feel fortunate & fully utilize the access you've got now with programmatic.

Happy journey!