Solo South East Asian route

Hi all,

I'm looking for some advice as a first time visitor to SE Asia. I'm an experienced traveller I've just not made it to that part of the world yet. To give some context on my trip, I recently lost somebody very close to me, it was very sudden and painful and I'm just coming around to sitting with it after the surreality of being in it. Planning funerals, scattering ashes etc.

I don't suspect I'll find any answers travelling but I do have a strong desire to be as far away from where I am currently as possible and to just press pause for a while. I will be working while I'm away (unfortunately I cannot afford the time off) so I guess that is a factor too.

I am not interested in partying or the noise of major cities so where possible I guess I would like to avoid that.

My trip is planned for April and May. All I have so far is starting in Hanoi and ending in Singapore.

Any advice on routes/places to visit on the way are appreciated. As ever thanks to this wonderful community.