It wasnt until i started “trying to win now and quit looking at the future” that i started consistently winning in my dynasty leagues. You have to find the balance between the two, which is why i stated, you need to get a top wr/rb for him. Im not saying you have to go get elliot/julio but you have to replace talent with talent and then try and get depth/picks in addition to the talent you are swapping.
I do my best to get as many studs on my team as i can, if they sit on bench then they sit on the bench. I at least dont have to worry about injury then.
Then when its nearing the playoff time and an desperate owner needs just 1 piece to make the playoffs i sell off a player for a kings ransom.
Also consider that another owner that isnt currently interested in ertz may become interested because of injury or needing an upgrade at te and can sacrifice a decent wr/rb to get him from you.