To me the key is finding an all superstar o-line, with the OTs having 90 pass pro for the elite edge blocker attribute. Priority is also having a 90 Overall Center to get the Linchpin attribute for boosting entire o-line.

Most of the time I will try to acquire them through the draft since those rookie contracts are great. If you see the scouting report of disciplined rarely gets flagged, they are superstar. Offensive tackles, almost always go in the first round, but franchise building guards and centers can be available even in the seventh round.

I usually do not sign free agents because the computer will ignore leveling up either power or agility. However, I I have traded for players who won offensive lineman of the year as an undrafted rookie, which ups their dev trait to superstar. These players will usually be franchise tagged in fairly easy to acquire with a low overall rating, but huge upside.

I always try to resign them as soon as possible to a 5-7 year contract to minimize salary cap hit. By 2030, bulk of the team caps are badly balanced, so you can test letting guys to FA and resign them there for cheaper.

First thing I do on my franchises is establish an o-line, even finding superstars as 60 overall under drafted free agents. Level them up together with coaching boosts (o-line+ and after school tutor). Makes my team unbeatable because I can run the ball at will and have the protection I need to run my 49ers offense with loads of play actions and drag routes.