I am on L1 in USA. Get selected in H1 lottery and current status is pending.

1. If H1 is pending and I travel to India and comeback before 1st October on L1... Does H1 remains valid?
2. If H1 is approved but not stamped and I travel to India and comeback before 1st October on L1... Does H1 remains valid?
3. If H1 is approved but not stamped and I trvel to India and comeback after 1st October on L1... Does H1 remains valid?
4. If I am in USA on L1 and H1 is approved...
a. Do I need to join IMMEDIATELY a company who filed H1?
b. Can I continue to work on L1?
c. How long I can wait to join H1 company without having any problem related to L1 or future H1 or GC?

Thanks in advance!!

There are a few changes on employment based visas recently.
For best advice, please consult your employer's attorney.