Fastest Possible Way To Get Existing Level 20 Character To 30? Good Reason - Need Some Help

I loved playing D2 in its original version, for at least five years. When the Resurrected Infernal version with all of the various updates and "expansion" appeared, three old friends who I originally played D2 with, and I, decided to buy the new version and have been playing. Unfortunately, I got a severe case of pneumonia and ended up in the hospital for almost five days before they got it under control. It's a much bigger concern when you are my age. I lost basically a week due to how sick I was, and the hospitalization.

In the interim, my buddies were continuing to play, and their main characters are all now at about level 35. I really, really want to be able to join them, and actually contribute but, to do that, I have to get to at least level 29-30 (where I have much better equipment to use, and will have deeper skills). Sure, my friends will help me along but I know how boring that is, from much previous experience, not to mention they literally just went through that content.

I've heard that Trist runs will quickly level you, but I've tried and its not working. I also heard that the Cow Level will quickly boost your level, but haven't found that to be the case either. Granted, I cant stay there long or I risk instant Death. Is there anything I can do just to get these next 9-10 levels very quickly? Thanks.

Normal

Tristram's level is too low. Until about level 25 I would do Cow (if it is not too slow or dangerous, maybe someone can help you) and

Travincal runs. From 25 to 35 normal

Baal runs