What?
That thing is nowhere near done. Flushing is also the worst thing to do.
Green to the end. This is a done bud.
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First it needs more water. The roots have filled the pot. Not much room for water and they will take in a lot of water when plumping up.
Next feed til the end or at least the last week. You can't flush nutrients from a plant. You can only remove salts from the soil.
Look for a balanced feed. Close to even numbers for NPK.
No need for bloom boosters, special additives, or unicorn farts. Its a plant. Keep it happy and the rest will follow.
Keep it super simple. Kiss.
Less is more.
Develope a good watering technique. Lift the pot. If it feels light water it. If its heavy don't.
When using synthetics either feed full strength and water, feed, water, feed, etc.
Or mix at 1/4 to 1/2 strength and feed every time.
Either way water once lightly and then water again until good run off a few minutes later.
The run off prevents salt build up.
Not bad for a first grow. They are sativa dominant and have a ways to go yet.