Following on from what OltonPete said, maybe their problems are due to be independent and maybe working with other airlines may help them... for instance - partnering with flybe in the regions so the right size aircraft is operating the correct route (specifically thinking Birmingham and Manchester). Could partner with Norwegian at Gatwick (same terminal unlike easyJet) to provide feed, freeing up slots for Norwegian to operate long haul - take over the Canaries, Barcelona, Alicante etc - leaving LH and Scandi to Norwegian, along with additional cities routes... could also provide assistance with the 73 MAX's.
Maybe partnerships are the way forward, instead of trying to be a wannabe TUI/Thomas Cook?