I'd suggest e4 but you'll have to prepare for a lot of replies from black like Sicilian, French or Petroff. If you hate memorizing openings, go for d4 (London System) as White then Slav defense or QGD as a reply to d4 as Black. If White moves e4 then reply with e5 as black. There are plenty of opening tutorials on youtube if you want to learn openings.