Where would we get the most bang for the buck? Fresh Content, Internal Links, or Schemas & Metatags

[SamD1234]

We cannot change the content on our website.And we have a lot of it.

Where would we get the most bang for our buck:

1. Adding lots of fresh content;
2. Linking Content Internally in ways that make the relationship between the content more clear;
3. Creating schemas and metatags for the content.

Or something else that we haven't thought of. Our content is not really conducive to social. It is legal information.

We have a Domain Authority of 61 / 100

Your help and experience is appreciated.

[EGOL]

1. Adding lots of fresh content;

Great content is extremely valuable.  Poor-quality content will harm your site in the Google rankings.   Average content isn't worth much.

1. Linking Content Internally in ways that make the relationship between the content more clear;

This should always be done.

1. Creating schemas and metatags for the content.

Sarah Palin would ask if you are putting lipstick on a pig.  If you have a pig then this is a waste of time.  If you have great content then it is worthwhile.

My choice is add lots of fresh content but it has to be really good or you are wasting your time.