Why can't I find any tactics in this game? [fen &quot;&quot;]

1. e4 {0} c6 {0} 2. d4 {4} d5 {0} 3. Nc3 {3} dxe4 {0} 4. Nxe4 {1} Bf5 {1} 5. Ng3 {3} Bg6 {0} 6. Nf3 {6} e6 {0} 7. c4 {9} Nd7 {0} 8. Be2 {5} Ne7 {0} 9. Bg5 f6 {0} 10. Bf4 {7} e5 {0} 11. dxe5 {2} Qc7 {0} 12. e6 {9} Ne5 {0} 13. h3 Rd8 {0} 14. Qc1 {11} Bf5 {0} 15. O-O {5} Bxe6 {0} 16. Bxe5 {2} fxe5 {0} 17. Qe3 {5} Ng6 {0} 18. b3 {8} Ba3 {0} 19. Ng5 {56} Qd6 {0} 20. Nxe6 {3} Qxe6 21. Ne4 {26} Qf5 {0} 22. Bg4 {11} Qf4 {0} 23. g3 {5} Qxe3 {0} 24. fxe3 {2} Be7 {0} 25. Rad1 {15} Rf8 {0} 26. Rxf8+ {8} Kxf8 {0} 27. Rxd8+ {1} Bxd8 {0} 28. Bf5 {11} Be7 {0} 29. Bxg6 {1} hxg6 {0} 30. g4 {2} a6 {0} 31. a4 {8} Kf7 {0} 32. Kg2 Ke6 {0} 33. Kf3 {1} b5 {0} 34. axb5 {13} cxb5 {0} 35. cxb5 {2} axb5 {0} 36. Ke2 {4} b4 {0} 37. Kd3 {1} Bd8 {0} 38. Kc4 {3} Bb6 {0} 39. Kxb4 {5} Kd7 {0} 40. Kb5 {1} Bxe3 {0} 41. b4 {1} Bg1 {0} 42. Ka6 {3} Kc6 {0} 43. b5+ {1} Kc7 {0} 44. h4 {13} Bb6 {0} 45. h5 {2} gxh5 {0} 46. gxh5 {1} Bd4 {0} 47. Nd2 {32} Kd6 48. b6 {3} Kc6 {0} 49. b7 {4} Kc7 {0} 50. Ne4 {11} Be3 {0} 51. Ng5 {25} Kb8 52. Ne6 {11} Bh6 {0} 53. Nc5 {12} Kc7 {0} 54. Ka7 {3} Kc6 {0} 55. b8=Q {2} Kxc5 56. Qb6+ {6} Kc4 {0} 57. Qc7+ {5} Kd4 {0} 58. Qd7+ {15} Kc4 {0} 59. Kb6 e4 {0} 60. Qe6+ {6} Kd4 {0} 61. Qd6+ {5} Ke3 {0} 62. Kb5 {3} Kf3 {0} 63. Qd1+ Kf2 {0} 64. Kb4 {13} e3 {0} 65. Qd8 {17} (65. Qd4 Kf3 66. Kc3 Kg3 67. Kd3 Kf3) 65... e2 {0} 66. Qf8+ {2} Kg2 {0} 67. Qa8+ {6} Kf2 {0} 68. Qf8+ {4} Kg2 69. Qe8 {20} Bd2+ {0} 70. Kc4 {12} e1=Q {0} 71. Qg6+ {6} Qg3 {0} 72. Qc6+ Kf1 {0} 73. Qg6 {15} Qc7+ {0} 74. Kd3 {3} Qc3+ {0} 75. Ke4 {2} Kf2 {0} 76. Qf5+ {4} Kg3 {0} 77. Qg6+ {5} Kh4 {0} 78. Kf5 {6} Qh3+ {0} 79. Ke5 {5} Qc3+ 80. Kf5 {1} Qd4 {0} 81. Ke6 {7} Qc4+ {0} 82. Kf5 {1} Qd5# {0} 0-1

I am White here.
I know every tactical theme-pin, fork, weak backrank, deflection, etc. But upon analyzing this game, I couldn't find any. How can I improve my recognition of tactics?
I know every tactical theme pin, fork, weak backrank, deflection, etc.
But upon analyzing this game, couldn't find any.

If you can't recognize a pin (e.g. 9. Bg5) then you don't know what a pin is. Here are 4 tactical themes in the first 20 moves:
9. Bg5 - pin
12. e6 - discovered attack
17. Qe3 - pin
20. ... Qxe6 - self-pin

How can I improve my recognition of tactics?

First you have to learn what they are.

Bg5 pins the knight against the queen. There is no immediate threat, there doesn't have to be, but this move means that the knight can't move without exposing the queen to capture.

There are &quot;hard pins&quot;, where a piece is pinned against the king and it would be illegal to move the piece, and &quot;soft pins&quot;, like here where moving the pinned piece would expose the piece behind it to capture.