A person cannot be anti-Trinitarian and pro-Truth; those are mutually exclusive. That is perhaps why you still won’t address the rest of my post, despite hinting at it twice and providing the full answer twice.
Let's look at the context. The background was what happened in John 6:1-15, the feeding of the 5,000. It is the next day when the conversation starts with literal bread, because the people had eaten their "fill of the loaves" the previous day. Jesus, however, tells them to "not work for the food that perishes, but for the food that endures to eternal life, which the Son of Man will give to you" (v. 27). That work is to "believe in him whom [God] has sent" (v. 29).
The people then ask for a sign, despite Jesus just having fed 5,000 from five loaves and two fish. They appeal to Moses providing "manna in the wilderness" (v. 31). Jesus refutes the argument by showing that it was God who gave the manna from heaven and he has now given something even greater from heaven, Jesus himself.
The whole point is that the manna that came from heaven was provided by God, just as the Son is the true bread that came from heaven and was provided by God, for eternal life instead of just mere, temporary, physical sustenance. Jesus says no less than five times, from verses 33-58, that he is "the bread that came down from heaven" (v. 58). While he is figuratively bread, he is literally life and literally came down from heaven.
These are clear claims to have come down from heaven, as is then seen once more in verse 62:
Joh 6:62 Then what if you were to see the Son of Man ascending to where he was before? (ESV)
So, Jesus states five times that he came down from heaven and then finishes by mentioning "ascending to where he was before." Where was he "before" that he would ascend to? Heaven.
As for the Father drawing people, it isn't necessarily or only through the OT, although it can include that; it's a spiritual work--showing a person the state of their heart; conviction of sin; the need for a Saviour; etc.:
Joh 6:64 But there are some of you who do not believe.” (For Jesus knew from the beginning who those were who did not believe, and who it was who would betray him.)
Joh 6:65 And he said, “This is why I told you that no one can come to me unless it is granted him by the Father.” (ESV)
It will also be through his work on the cross:
Joh 12:32 And I, when I am lifted up from the earth, will draw all people to myself.” (ESV)