Travelling SE Asia solo as a woman - advice on packing and route?

I am travelling SE Asia for 6 weeks, leaving in two weeks. I will however likely extend this trip and will probably be 2-3 months total.

It would be great to get some advice on my packing list and route (both below). I have no idea what I'm doing but have just done some research around where I am likely to find DNB (absolute dnb nerd, happy to spend my life chasing it around the world hahaha) and where will be good for getting in some partying but also chilling, not too fussed to do anything crazy in terms of hikes/ activities.

All I've booked is my flight to Bangkok and return from Bali back to the UK, and the first two nights hostels in Bangkok.

Re. packing list - I don't mind slightly overpacking clothes but I also do wanna do some shopping out there. I have a 120L Backpack.

2x weeks Bali, 2x weeks Veitnam, 2x weeks Thailand, planning 2-4 days in each place. I am aware my plans will probably change if I meet people and want to go with them/ want to stay in places longer. Also open to suggestions of where else I should go if I extend!

Route:

Thailand- Bangkok -> Patong Beach -> Koh Samui -> Koh Pangan -> Koh Tao -> Back to Bangkok night before flight (I know it's a little rogue to go from Bangkok to Phuket and then the rest of my Thailand route but I have some friends there who are leaving Thailand a few days after I get there that I wanna catch for a few days)

Veitnam- Hanoi ->Ha Long Bay (day trip) -> Da Nang -> Hoi An ->Ho Chi Minh

Bali- Canggu -> Uluwatu -> Nusa Pendia -> Ubud - Gilli T

Packing List:

- Headphones

- Earbuds

- Portable charger

- Passport (duh)

- Chargers and local plugs

- Microfibre Towel

- Essential Toiletries (Moisturiser, Sunscreen, Hair Gel)

- 3 going out tops

- 3 casual tops

- 1x Denim Shorts

- 2x skirts (1 denim 1 comfy)

- 1x Trousers

- 5x Bikinis (I know probably overkill, don't mind)

- 2x gym sets (I'll do a lot of running and pilates/ yoga)

- 1x beach cover up set

- 1x Dress

- 1x Thermal Long Sleeve

- Makeup (basics)

- Teva sandals

- Salomon trainers

- Flip Flops

- 10x Underwear

- 3x socks

- 1x fold up water proof jacket (folds up small)

- sunglasses

- tote bag for beach

- Uniqlo cross body bag

- Sleep mask

- Padlock