For one, learn the Adjacent Edge Parity Alg, you will need it.
You likely are pairing all the edges at the start and then do one of two cases to get back into Cubeshape. This step can get heavily shorter with experience, so do a lot of solves, maybe even some Cubeshape only solves.
Easy Cubeshape cases like Scallop-Kite, Scallop-Scallop or Kite-Cube, good Fists and Shield-Cube are the most beneficial to learn now, as Scallop-Kite and Scallop-Scallop will later become the intermediate Cubeshape method, Kite-Cube teaches you multiple easy cases at once and Good Fists come up very often..
Which Method are you using?
If I may assume Vandenbergh..
Learn all the CO, EO and CP Cases. There are only a few for each step, the CO cases are all intuitive anyway and doing so early will greatly improve your times now.