Hi Jammmail,
Great that you are back playing table tennis after a long break. Its wuite tough to say about changing styles without seeing you play but I’d probably say that its such a big change that you’d most likey be better of staying as an attacking player and really working on keeping out the opponents and getting a strong first opening attack.
If you can send us in a video we’d be happy to analyse it and give you some feedback and tips on where you can improve etc.
If you still feel that a change to a modern defensive style would be worth a shot in a few weeks/months we can give you some advice on that too.