Unfortunately I lost when I went all in at the beginning when the cards had not yet come out and the cards on the table were not in my favor even though I had the strongest card at that time KA and my opponent had 6A but he beat me because he got Three of a kind 6 I was eliminated in 21st place out of 56 participants, even so I am happy to be at the same table with you it is rare to be at the same table with fellow forum members, hopefully we can meet again another time friend

It is what it is. You have to take risks in tournaments. Going all-in pre-flop with AK is not a bad move, especially when we're talking about freeroll, where there's nothing to lose.
Sometimes the biggest loss is investing too much time in playing for trivial amounts, or spending a few hours in a tournament and dropping out just outside of the paid places.
If I play freerolls, it's usually in addition to playing other tables, or doing some other things online and just playing "in the background".
I even once got AA, but was ultimately beaten by a small card that gets a Straight. That's how it is sometimes, even though we have the strongest hand, it doesn't guarantee a strong combination at the table. Luck plays a big role in poker, not just skill.
In my opinion, it's not a waste of time. Playing freerolls can hone your skills and patience because more people participate. Plus, you can have fun without having to buy in, so you don't have to worry about losing anything.