Bro, I also newbird to the bird shoot thing, you have way better shots than me. My focus other than shooting bird is also enjoy nature and walk walk a bit. I am happy to shoot squirrels and lizards and monkeys other than birds. My setup now is 300mm with 2X teleconvertor on DX body, gives me around 900mm. Because its prime, I cant do the zoom in zoom out thing. But I learned a few tricks from hunters; to find birds, I usually be patient and try to detect movements in the leaves or branches. Or if its far, I use a light weight binocular hang around the neck, I use Nikon Aculon 8X21, very small and lightweight, yet cheap and clear optics. (only I wear specs so the eye relief not so good). Then work the binos in a grid system, left to right, top to down, to find creatures. It is more comfortable to spot using binos than thru the camera viewfinder (tiring and heavy), with binos you can view for a long time like birders do. Hunters call it 'glassing'.
Then once you find the bird, very important here: Keep your eyes on the bird, do not take your eyes elsewhere to fumble with gear or settings, or you may easily loss it to nature's camouflage again. While my eyes are on the bird, I use my hands to align my lens like a rifle to my eyes (think like the front sight rear sight thing) and usually can find the bird this way.
I have a Jobu Jr Deluxe bought off another bro here on CS, it works great. But I use a Manfrotto monopod with tilt head most of the time for better mobility, as mentioned, I like to hike around and one leg monopod easy to move than shouldering a 3 leg tripod. I think photographically better results are gotten from the gimbal due to the stability and ease of use. Maybe I should use the gimbal more. The oldbird bros here, what you all use? Free hand or monopod or tripod with gimbal?