You should try the Raynox-250 adapter on your Canon bridge. I found zero minimum macro quite limiting. I mean how many subjects are going to let you get that close? The Raynox changes all that and if you dedicate a back pant pocket to it alone, is dead easy and quick to plop on.
Also – no macro shooting with the TG-7? Sounds like a huge waste of random opportunities to me!
My primary interest for macro are mosses (I do take photos of liverworts, hornworts and lichen as well). I use TG-7 for stacked focus macro with 1.2 and 4x zoom. When there are lots of protruding stems some gets blurry, TG-7 has minimum focal length of 1 cm. With the SX70 I can still get that photo just no stacking. Zero minimum means no limits.
For insect photos, I tried focus bracketing on TG-7 and zooming in with the SX70, from 30 - 50 cm. The results were fine, not quite great. I need to practice more, both cameras are new to me. I will look up Raynox as well.
Another stacking trick I discovered is to just shoot a slow ‘scan’ 4K video of the subject and then later in a vid editor, go hunting for best frames to make a stack. In a 5 sec clip you’ll have 150 frames to choose from. Like this one, which remains my rarest find on iNat (just me!).
I’m interested most in plants than in birds, but I’d like to photograph insects as well. I also like marine life but then I’d need a whole different camera for those. My favourite kind of photography is landscape photography.