I have actually enjoyed fixing and modernizing broken legacy systems. But it sounds like your company has placed too much cognitive load on you. Most people know only one or two stacks.
I read your other comments too, I think you are really overworked. I would leave asap.
There are tons of easy jobs but they are boring. You can work for government or other bureaucratic companies but work will be boring and it will frustrate you because you won't be able to move fast or do the right thing.
Most of the jobs are boring, even if they have hard challenges, they will get boring if you don't care about the problem or if you don't have some independence to choose what to work on.
Now if you want an easy job, that is not boring, I would look for companies/projects that I believe in. This might be companies in climate change or some other cause. It may still be frustrating because you may want to do certain things that your boss may not agree with. IMO, frustration is better than being bored.
This is what I am doing:
1. I made a list of all companies and non-profits that are working on things I care about.
2. I found their leaders/employees on Twitter and LinkedIn.
3. I am writing down their tech stacks from their job postings, employee posts, etc. Also wrote down their salary ranges, revenues, etc.
4. I have found a few companies whose tech lines up with my expertise or they are thinking of using something that I am good at. I use this to review and update my skills and resume.
5. I review employees' posts and try to determine which companies/non-profits have happier employees. Also look for any signs of long work hours or burnt out employees.
6. When I am ready I will approach these companies. Since many non-profits pay so little and move so slow, I might need to freelance with multiple non-profits to make enough money and not get bored.
It is a tedious process but I have a pretty good idea where to make my move.
I read your other comments too, I think you are really overworked. I would leave asap.