Manic Mary, if you’re still looking in, for sure this is a bit of a slog with, in my view, a few too many obscure words. However there are clues to the theme e.g. 4dn (google it) and my advice would be to solve what down clues you can, the first half dozen are straightforward, get 1ac (can=fire from job) then13ac, 11ac, both anagrams. The lost letters make a three word phrase, from the same source as 4dn. Guess this and then you have the letters to add to the wordplay for each.
The complication is that in eight clues the definitions and wordplay don’t match. Leave sorting them to later. You should by now know what the “lost” land is at 15dn.
Apologies if this amount of help upsets anyone but I think folk should be encouraged to persevere rather than give up.