Pixelmator is great and integrates well with Apple's tooling for batch processing.
For video, the free version of DavinciResolve goes a very long way, and their Studio is a single-payment-life-time license.
DaVinci Resolve also runs on Linux, so you won't be locked to staying on MacOS if you want to switch OSes but maintain your skillset.
DaVinci Resolve also runs on Linux, so you won't be locked to staying on MacOS if you want to switch OSes but maintain your skillset.