Itinerary Advice: 15 Days Solo in May. Should I keep Pattaya or focus on Bangkok/Samui for nightlife?

hi everyone

I'm finalizing my 15-day solo trip for next May and I need some logistical advice. My current plan is:
BKK (3 nights) -> Pattaya (2 nights) -> Khao Sok (3 nights) -> Koh Phangan (4 nights) -> Koh Tao (3 nights)

My main reason for including Pattaya is the famous nightlife and red-light districts however, im starting to think the detour from Pattaya back to Bangkok just to fly south to Surat Thani is a bit of a waste of time

my questions:
1.Can I get a similar "Pattaya-style" nightlife experience in Bangkok (Nana/Soi Cowboy) or Koh Samui (Chaweng) instead? If so, I’m considering dropping Pattaya to save time.

2.Is the nightlife in Koh Samui comparable to Pattaya in terms of variety and scale for a solo male traveler?

3.If I drop Pattaya, where should I add those extra 2 days? More time in Khao Sok or maybe an extra night in Bangkok?

Looking for a mix of great nature (Khao Sok/Tao) and intense nightlife. Thanks for the help!