Help me decide a direction!

After a long hiatus, I want to get back into photography/video I still have my first camera (Sony A7 II with an assortment of lenses. 70-200 f4, 105 macro f2.8, kit lens and 50 f1.8) I have owned an A1 before which I absolutely loved and wish I still had. My one true love is wildlife photography but I want to get into video as well. I’ve been considering 2 options. Sell it all and upgrade to a Canon R5 (or something similar I’m open to options). Or stay Sony and upgrade to the A7 IV. 4K 120 is extremely attractive for wildlife video.

I’m open to other options as well, let me know your thoughts!

Thanks in advance!