Gosh, I really feel for your dilemma! But, I’ll be completely honest with you…you’re not going to find the answer on TSR! Instead, you should really do some soul searching to come to a conclusion!

But, if I can give you my perspective, here is some advice.
Option 1: Take Maths, Physics and English lit.
Sticking to 3 A-levels is often the best choice, even for high achieving students such as yourself. With this combo, you’ll be able to apply to all the courses you are interested in.
But, if you are keen on taking 4 A-levels…
Option 2: Take Physics, Maths, FM and English lit if you decide to take physics at uni.
FM can open lots of doors to certain physics courses! And, considering your maths ability, it’s defiantly worth considering!

Alternatively, if you decide to take English lit, you could…
Option 3: Take Physics, English and history/Philosophy.
This way, you can keep doing physics out of interest, whilst also having another essay subject to prepare you for an English lit course.
You could also take maths as a fourth if you wanted, but if it feels like too much, you could always drop it later.
Another option, and I know this may sound crazy, is to actually start off doing 5 A-levels.
Option 4: take physics, maths, FM, English lit and history/philosophy.
I had a friend who started off with 5 (bio,chem,maths, FM and psych) and eventually dropped psych since she didn’t like it.
This may not be an option for you since some sixth forms wouldn’t allow this (which is understandable). But, if you do have this option it might help you decide, since you’ll get a feel for lots of subjects and can drop to 4 or 3 in the first few weeks/months. You might find you’ll have more clarity once you start studying your A-levels.

Ultimately, this is just my perspective—choose whatever feels right for you! But, the most important thing is that It’s your degree/ A-levels, so study what feels right for you! Don’t let people sway you, because you know what is right for you.