Trench Improvement

I was reading this article that stated our O line had some injuries and those returning starters could help in the upcoming season. Yet, every post is always about skill positions to improve the squad and nothing to help develop a sturdy base to the offense, or add depth to the DL.

Is there no draft projections or FA signings that could help the team improve in this area?

If so, (in your opinion) who should the team target in FA or the the draft?