My current neovim config(much broken)

init.vim

call plug#begin("~/.config/nvim/plugged")

  Plug 'neoclide/coc.nvim', {'branch': 'release'}
  Plug 'wakatime/vim-wakatime'
  Plug 'andweeb/presence.nvim'
  Plug 'artanikin/vim-synthwave84'
  Plug 'scrooloose/nerdtree'
  Plug 'Xuyuanp/nerdtree-git-plugin'
  Plug 'tiagofumo/vim-nerdtree-syntax-highlight'
  Plug 'christoomey/vim-tmux-navigator'
  Plug 'morhetz/gruvbox'
  Plug 'airblade/vim-gitgutter'
  Plug 'vim-airline/vim-airline'
  Plug 'vim-airline/vim-airline-themes'
  Plug 'scrooloose/nerdcommenter'

call plug#end()" Everything after this line will be the config section

if (has("termguicolors"))
 set termguicolors

endif
set background=dark
colorscheme gruvbox
set tabstop=4
set shiftwidth=4
set expandtab
set encoding=utf8
set number
" coc config
let g:coc_global_extensions = [
  \ 'coc-pyright',
  \ 'coc-clangd',
  \ 'coc-json',
  \ ]

function! s:tab_completion()
  let info = complete_info(['pum_visible', 'items'])

  if info.pum_visible
    if len(info.items) <= 1
      return "\<C-y>"
    else
      return "\<C-n>"
    endif
  endif

  return "\<C-g>u\<TAB>"
endfunction

inoremap <silent><expr> <TAB> <SID>tab_completion()
inoremap <expr> <Tab> pumvisible() ? "\<C-n>" : "\<Tab>"

" air-line
let g:airline_theme='gruvbox'

let g:airline_powerline_fonts = 1

if !exists('g:airline_symbols')
    let g:airline_symbols = {}
endif

" unicode symbols
let g:airline_left_sep = '  '
let g:airline_left_sep = ' ^v '
let g:airline_right_sep = '  '
let g:airline_right_sep = ' ^w^`'
let g:airline_symbols.linenr = ' ^p^j'
let g:airline_symbols.linenr = ' ^p '
let g:airline_symbols.linenr = '  '
let g:airline_symbols.branch = ' ^n^g'
let g:airline_symbols.paste = ' ^a'
let g:airline_symbols.paste = ' ^~'
let g:airline_symbols.paste = ' ^h '
let g:airline_symbols.whitespace = ' ^~'

" airline symbols
let g:airline_left_sep = ' ^b '
let g:airline_left_alt_sep = ' ^b '
let g:airline_right_sep = ' ^b '
let g:airline_right_alt_sep = ' ^b '
let g:airline_symbols.branch = ' ^b '
let g:airline_symbols.readonly = ' ^b '
let g:airline_symbols.linenr = ' ^b '

nmap <C-n> :NERDTreeToggle<CR>
vmap ++ <plug>NERDCommenterToggle
nmap ++ <plug>NerdCommenterToggle