I can't figure out how to find tactics Why is it hard for me to find tactics?

For example,  I want to take their queen, but I don't know how can I get to specific back steps, unless I play normally (it would take time).
Do you mean the the retrograde analysis as a part of problem chess? In this case, I think the main thing in retrograde analysis is to ask the right questions. What kind of pieces should arise in the past? Where should the pawns come from? Also, experience with chess itself is very helpful..
Here is simple classic.
[FEN &quot;4k3/8/8/7K/8/8/8/8 w - - 0 1&quot;]

Stipulation: White and Black retract a move and then helpmate in 1 move
It is obvious White needs material to mate (what piece and where) and it is remarkable to see the black king on its initial position e8, so castling could have been possible in the last position. (experience). But where is the black rook?! It seems helpful for the kings to come nearer (experience).
All this together gives the solution. Retract these moves: 1. Kg6xRh5 Rh8xQh5, and the helpmate happens: 1...0-0 2. Qh5-h7#.
[Title &quot;Retrograde Analysis&quot;]
[FEN &quot;4k2r/8/6K1/7Q/8/8/8/8 b - - 0 1&quot;]

1... O-O Qh7

I hope this helps.