Not sure about the first picture, 2nd one looks like garden sage, third one looks like rhubarb, no idea on the 4th one, 5th one looks like apple mint or lemon balm.

The final photo looks like Lamium purpureum, a weed or possibly Lamium amplexicaule, Henbit. A view of the flower from the side would help id it definitely. It isn't either mint or lemon balm.

No.2 is Salvia officinalis - culinary sage
No.3 is rhubarb
No.4 could be either Lovage or Angelica. On balance I'd go for Lovage.

I agree with the sage and lovage. I am a little surprised at the lovage, since it is a very large plant for a raised bed. The sage plant does not need pruning, unless you want to for cosmetic reasons.

If I were in your situation, I would consider starting new, with plants that I prefer for my tastes. The sage would transplant, should you choose to keep it. I like knowing where my plants came from. But do some research too on spread- if the one plant is a mint or lemon balm, it will overtake the entire bed with runner roots. Also consider water requirements- sage, thymes, oreganos like more drought conditions, while basils and mints like a lot more water.

As far as raised bed care, search forums. I am not super familiar with them, but believe they need more of a certain soil type, and may need fertilizing more often than in ground beds.

I agree with all the ID's. Lovage would also be my suggestion. That cluster of new growth looks like what a perennial like lovage would do. (Angelica is a biennial.) I'd also say Lamium, perhaps L. purpureum, for the last as well.

I wouldn't prune the sage either. Wait until after it blooms late spring/early summer if you have to - and the blooms are beautiful. And sage isn't that tough to save seeds from and it is reasonably easy to grow from seed if you want to start some new plants.

FataMorgana

At this point in the year I would just buy some herbs, maybe edible flowers, in pots and plant them. I'd avoid planting anything aggressive like strawberries and mints (and weeds) in that box.