The Texans better plan on picking up their starting left tackle in FA. Because for the last 10 years, over 50% of the drafted 1st round tackles have been busts "
https://www.si.com/mmqb/2016/02/24/nfl-draft-combine-offensive-tackles-history". If you want to be sure of getting the LT issue fixed, your going to have to go big in FA, for Trent Brown (NE), or maybe Donavan Smith (TB). After I signed the top free agent tackle available, I would draft several O-Linemen in the first few rounds. However, I would expect that some of these drafted O-Linemen will be wasted picks.
Hitting this problem with a combination of solutions is the only way it will get fixed