to convert my licence to EASA and fly for commercial airline in UK
Unless the OP only wants to instruct for the LAPL then he needs at least CPL level knowledge and if he ever wants to get to the airlines then he needs his ATPLs. And that’s the obvious place to start. If he wants to earn money from flying other than instructing for the PPL then he needs the CPL flying.
Let’s leave it at that, shall we!