You weren't as aggressive with your early fleas and venoms as you should have been, so the tank player got their share of the map experiencing minimal pressure. The tank player managed to build two stingers covering the midpoints with zero opposition, which shouldn't be happening. This is despite the map heavily favoring spiders and heavily unfavoring tanks.
You definitely should have been more active with your fleas at certain times. At 2:25 you have four fleas idling southeast against an incoming kodachi instead of applying any sort of pressure on the tank player's base.
If your venoms were meant to be defensive, then you might as well have built redbacks instead. Redbacks, being a DPS riot rather an AOE riot, should be able to handle sparse tanks and lotus expansions much more effectively. Early on, tanks have nothing to answer against redbacks + recluse, regardless of widow, but the tank player's unthreatened economy lends well to building emissary.
At 11:15, you amass 1.5k in hermit in your base instead of a crab, before you see your first emissary. Hermits have next to no value against tanks due to their low range and low DPS, so they're a bit of a waste. At 13:40 your engineer commander runs into a stinger, tanking for hermits. It should be the other way around.
Crabs are okay. Spired crabs against tanks are great. At 20:00 you lose your unspired crab and many recluses in a very avoidable situation.
Widows can make great cost as a consequence of removing key targets, so you can build widows against units as light as ogres or even stingers. Teams example: In
https://zero-k.info/Battles/Detail/1648668 ,
aioeieoiao uses his widow to stun a felon at 4:50, allowing us to easily remove the felon + another felon. He does it again at 9:05, enabling us to remove another felon + an aspis.